Anti-countercurrent system, multi-split charging circuit and charging system

Abstract

The utility model provides an anti-countercurrent system, a multi-split charging circuit and a charging system, the anti-countercurrent system comprises at least two anti-countercurrent units, and the at least two anti-countercurrent units are respectively connected with the output end of a power supply; each anti-countercurrent unit is connected with a respective battery so as to transfer the voltage of the power supply to the battery; each anti-countercurrent unit is configured to judge the voltage of the output end of the power supply and the voltage of the battery side; and under the condition that the voltage of the battery side is greater than the voltage of the output end of the power supply, the power supply access of the battery connected with the anti-countercurrent unit is switched off. The field effect transistor with smaller voltage difference is used as an anti-reflux device, the problem of current reflux of the battery is solved with low-cost materials, the battery is fully charged better, and the charging efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery charging, and in particular to a backflow prevention system, a one-to-many charging circuit and a charging system. Background Art

[0002] In the common one-to-many charging circuit, when the voltage of some batteries is high but the voltage of other batteries is low, the battery with high voltage charges the battery with low voltage with extremely high current, which will cause battery over-current charging and damage.

[0003] The common existing solution is to add a diode at the front end of the battery to avoid the problem of current reverse flow.

[0004] However, the application of diodes has some significant disadvantages: first, the reverse leakage current characteristic of the diode itself is a problem that cannot be ignored. When the adapter power is unplugged, the battery current will leak through the diode in reverse, generating a leakage current of about 0.1mA to 0.5mA. When this tiny current flows through the light-emitting diode, it will cause it to be slightly bright, affecting the appearance of the device; and the voltage difference of the diode is large, and the voltage difference of most diodes is between 0.3V and 1V, which will cause the battery to be unable to be fully charged: for example, if the adapter voltage is 12V, the fully charged battery voltage is also 12V, but due to the presence of the diode, the voltage between the adapter and the battery will be divided. Assuming the voltage division is 0.5V, the battery can only be charged to 11.5V and cannot continue to charge, which causes the battery to be unable to be fully charged, thus affecting the product's service life and endurance.

[0005] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present application and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Utility Model Content

[0006] In order to solve at least one of the above problems, the present application proposes a backflow prevention system, a one-to-many charging circuit and a charging system.

[0007] According to the first aspect of the present application, at least one embodiment of the present application provides an anti-backflow system, comprising: at least two anti-backflow units, wherein: the at least two anti-backflow units are respectively connected to the output end of the power supply; each of the anti-backflow units is respectively connected to its own battery to transfer the voltage of the power supply to the battery; each of the anti-backflow units is configured to: judge the voltage between the output end of the power supply and the battery side; and when the voltage on the battery side is greater than the voltage on the output end of the power supply, cut off the power supply path of the battery connected to the anti-backflow unit.

[0008] For example, in some embodiments of the present application, each of the anti-backflow units includes: a field effect transistor, the source of the field effect transistor is connected to the output end of the power supply, and the drain is connected to the voltage input end of the battery; a gate driver, the gate driver includes a first pin, a second pin and a third pin, wherein: the first pin is connected to the source of the field effect transistor; the second pin is connected to the gate of the field effect transistor; the third pin is connected to the drain of the field effect transistor.

[0009] For example, in some embodiments of the present application, the gate driver is configured to: detect the voltage of the output end of the power supply and the voltage input end of the battery, and turn off the field effect transistor when the difference between the voltage input end of the battery and the output end of the power supply is greater than a first threshold.

[0010] For example, in some embodiments of the present application, the gate driver includes a chip LM5050.

[0011] For example, in some embodiments of the present application, each of the anti-backflow units also includes: a first capacitor, one end of which is connected to the first pin and the other end is grounded; a second capacitor, one end of which is connected to the third pin and the other end is grounded.

[0012] For example, in some embodiments of the present application, each of the anti-backflow units further includes: a resistor; the gate driver further includes a fourth pin and a fifth pin, wherein: one end of the resistor is connected to the fourth pin, and the other end is connected to the fifth pin; the fifth pin is grounded.

[0013] For example, in some embodiments of the present application, the gate driver further includes a sixth pin, and the sixth pin is connected to the power supply.

[0014] According to the second aspect of the present application, at least one embodiment of the present application provides a one-to-many charging circuit, comprising: an anti-backflow system as described in any one of the first aspect; at least two batteries, connected one-to-one with at least two anti-backflow units in the anti-backflow system.

[0015] According to the third aspect of the present application, at least one embodiment of the present application provides a charging system, comprising: the one-to-many charging circuit as described in the second aspect; a power supply connected to the one-to-many charging circuit to charge the at least two batteries.

[0016] For example, in some embodiments of the present application, the charging system also includes: an adapter connected between the power supply and the one-to-many charging circuit to output voltage levels corresponding to the at least two batteries to the one-to-many charging circuit.

[0017] The present application provides an anti-backflow system, a one-to-many charging circuit and a charging system, which utilize field effect transistors with a smaller voltage difference as anti-backflow devices, solve the current backflow problem of the battery with low-cost materials, and enable the battery to be fully charged better, thereby improving charging efficiency.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing in detail exemplary embodiments thereof with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent. The accompanying drawings described below are only some embodiments of the present application, and are not intended to limit the present application.

[0020] Figure 1 It is a schematic diagram of a one-to-many circuit using diodes in the prior art;

[0021] Figure 2 is a schematic diagram of an anti-backflow system according to an embodiment of the present application;

[0022] Figure 3 A one-to-many charging circuit according to an embodiment of the present application is shown;

[0023] Figure 4 An exemplary embodiment of a charging system is shown. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0025] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices, etc. may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0026] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations or steps, nor do they have to be executed in the order described. For example, some operations or steps can be decomposed, and some operations or steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0027] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0028] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0029] Figure 2 It is a schematic diagram of the anti-backflow system of an embodiment of the present application.

[0030] like Figure 2 As shown, the backflow prevention system 201 includes at least two backflow prevention units 2011-201N. At least two backflow prevention units are respectively connected to the output end 2021 of the power supply VIN. Each backflow prevention unit is respectively connected to a corresponding battery to transfer the voltage of the power supply to the battery.

[0031] Each backflow prevention unit is configured to: determine the voltages of the output terminal 2021 of the power supply and the battery side, and when the voltage of the battery side is greater than the voltage of the output terminal 2021 of the power supply, shut off the power supply path of the battery connected to the backflow prevention unit.

[0032] According to some embodiments, each anti-backflow unit includes: a field effect tube 20111, a gate driver 20112, a first capacitor 20113, a second capacitor 20114 and a resistor 20115. Among them, taking the anti-backflow unit 2011 as an example: the source of the field effect tube 20111 is connected to the output end of the power supply VIN, and the drain is connected to the voltage input end of the battery. The gate driver 20112 includes a first pin 1, a second pin 2, a third pin 3, a fourth pin 4, a fifth pin 5 and a sixth pin 6, wherein: the first pin is connected to the source of the field effect tube 20111; the second pin is connected to the gate of the field effect tube 20111; the third pin is connected to the drain of the field effect tube 20111; one end of the resistor 20115 is connected to the fourth pin, and the other end is connected to the fifth pin; the fifth pin is grounded; and the sixth pin is connected to the power supply VIN. One end of the first capacitor 20113 is connected to the first pin, and the other end is grounded. One end of the second capacitor 20114 is connected to the third pin, and the other end is grounded.

[0033] According to some embodiments, the gate driver 20112 is configured to detect a voltage V between the output terminal 2021 of the power supply and the voltage input terminal of the battery. OUT , and when the voltage difference between the voltage input terminal of the battery and the output terminal of the power supply is greater than the first threshold, the field effect tube is turned off.

[0034] According to some embodiments, the gate driver is a chip LM5050.

[0035] For example, if the first threshold is set to 30mV, then the voltage at the voltage input end of the battery minus the voltage at the output end of the power supply>30mV, the MOSFET can be turned off. OUT-1 The voltage of VIN is detected, and V OUT-1 -VIN>30mV, the second pin of the gate driver triggers the shutdown field effect tube.

[0036] The present application proposes an anti-backflow system, which uses a field effect transistor with a smaller pressure difference as an anti-backflow device, solves the current backflow problem of the battery with low-cost materials, and enables the battery to be fully charged better, thereby improving the charging efficiency.

[0037] Figure 3 The one-to-many charging circuit of an embodiment of the present application is shown. The one-to-many charging circuit 301 includes the anti-backflow system 201 as described above and at least two batteries 3011-301N. At least two batteries are connected one by one to the anti-backflow unit in the anti-backflow system, so that the anti-backflow unit collects the voltage of the battery and makes a judgment to ensure that the high-voltage battery does not backflow to charge the low-voltage battery.

[0038] Figure 4A charging system of an exemplary embodiment is shown. The charging system includes a power supply 401 and a one-to-many charging circuit 301. The power supply 401 is connected to the one-to-many charging circuit 301 to charge at least two batteries in the one-to-many charging circuit.

[0039] According to some embodiments, the charging system further includes an adapter 402 connected between the power supply 401 and the one-to-many charging circuit 301 to output voltage levels corresponding to at least two batteries to the one-to-many charging circuit.

[0040] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in the present application, these principles can be applied to many other embodiments.

[0041] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0042] The exemplary embodiments of the present application are specifically shown and described above. It should be understood that the present application is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present application is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A backflow prevention system, characterized in that: include: At least two backflow prevention units, where: The at least two backflow prevention units are respectively connected to the output ends of the power supply; Each of the anti-backflow units is connected to a respective battery to transfer the voltage of the power supply to the battery; Each of the anti-backflow units is configured as: Determine the voltages at the output end of the power supply and the battery side; and when the voltage at the battery side is greater than the voltage at the output end of the power supply, shut off the power supply path of the battery connected to the backflow prevention unit.

2. The backflow prevention system according to claim 1, characterized in that: Each of the anti-backflow units comprises: A field effect transistor, wherein the source of the field effect transistor is connected to the output end of the power supply, and the drain of the field effect transistor is connected to the voltage input end of the battery; A gate driver, the gate driver comprising a first pin, a second pin and a third pin, wherein: The first pin is connected to the source of the field effect tube; The second pin is connected to the gate of the field effect tube; The third pin is connected to the drain of the field effect tube.

3. The anti-backflow system according to claim 2, characterized in that: The gate driver configuration is: The voltages of the output terminal of the power supply and the voltage input terminal of the battery are detected, and when the difference between the voltage input terminal of the battery and the output terminal of the power supply is greater than a first threshold, the field effect tube is turned off.

4. The backflow prevention system according to claim 2, characterized in that: The gate driver includes a chip LM5050.

5. The backflow prevention system according to claim 2, characterized in that: Each of the anti-backflow units also includes: A first capacitor, one end of the first capacitor is connected to the first pin, and the other end is grounded; A second capacitor, one end of the second capacitor is connected to the third pin, and the other end is grounded.

6. The backflow prevention system according to claim 2, characterized in that: Each of the anti-backflow units also includes: resistance; The gate driver further includes a fourth pin and a fifth pin, wherein: One end of the resistor is connected to the fourth pin, and the other end is connected to the fifth pin; The fifth pin is grounded.

7. The backflow prevention system according to claim 2, characterized in that: The gate driver further includes a sixth pin, and the sixth pin is connected to the power supply.

8. A one-to-many charging circuit, characterized in that: include: The anti-backflow system according to any one of claims 1 to 7; At least two batteries are connected to at least two backflow prevention units in the backflow prevention system in a one-to-one correspondence.

9. A charging system, characterized in that: include: The one-to-many charging circuit as claimed in claim 8; A power supply is connected to the one-to-many charging circuit to charge the at least two batteries.

10. The charging system according to claim 9, characterized in that: The charging system further comprises: An adapter is connected between the power supply and the one-to-many charging circuit to output voltage levels corresponding to the at least two batteries to the one-to-many charging circuit.

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