Digital lithium battery charger and device

Abstract

The embodiment of the utility model provides a digital lithium battery charger and a digital lithium battery device, and solves the problem that when too many chargers are charged together, the charging cost is too high or the chargers interfere with each other. The digital lithium battery charger comprises a display unit which comprises a display ground wire; the display power supply unit comprises a power supply ground wire, a charging current sampling module and a discharging current sampling module; the first end of the charging current sampling module is connected with the power supply ground wire; the communication unit comprises a control ground wire; wherein the power supply ground wire is not connected with the control ground wire; the second end of the charging current sampling module, the third end of the discharging current sampling module, the display ground wire and the control ground wire are in common ground connection.

Description

Technical Field

[0001] The utility model relates to the field of battery charging equipment, in particular to a digital lithium battery charger and a device. Background Art

[0002] In the actual production site, when the same lithium battery is used at the same time, the same type of lithium battery must be charged simultaneously, and each charging device must have a high-voltage 220V power supply. At this time, the display system of the equipment is basically the same, and it is required to be able to realize a multi-channel lithium battery charging system, which is more convenient for on-site observation, use and data recording.

[0003] The stability of the system and the reliability of digital lithium battery communication require that the ground wire be as short as possible. The conventional solution is to separate the ground wires of the charger and lithium battery communication and use photoelectric isolation for digital communication. However, the cost of isolating the power supply when too many chargers are charged together is too high. Without photoelectric isolation, the communication between the charging device and the battery is easily interfered, resulting in interference from the electrical connection and common ground of the power supply of each device. Utility Model Content

[0004] In view of this, the embodiments of the present invention provide a digital lithium battery charger and device, which solves the problem of excessively high charging costs or mutual interference when too many chargers are charged together.

[0005] In a first aspect, an embodiment of the present utility model provides a digital lithium battery charger, comprising:

[0006] A display unit, including a display ground line;

[0007] The display power supply unit includes a power supply ground line, a charging current sampling module and a discharging current sampling module; the first end of the charging current sampling module is connected to the power supply ground line;

[0008] a communication unit, including a control ground;

[0009] Among them, the power supply ground line and the control ground line are not connected; the second end of the charging current sampling module, the third end of the discharging current sampling module, the display ground line and the control ground line are connected to the same ground.

[0010] In one embodiment of the utility model, the display unit includes a display power supply terminal; the communication unit includes a communication power supply terminal; the display power supply terminal includes a power supply terminal; the display power supply terminal and the communication power supply terminal are commonly connected to the power supply terminal.

[0011] In an embodiment of the present invention, the output voltage of the power supply end is 5V.

[0012] In one embodiment of the utility model, the display power supply unit includes a first electrolytic capacitor and a second electrolytic capacitor; the cathode of the first electrolytic capacitor is connected to the second end of the charging current sampling module; the cathode of the second electrolytic capacitor is connected to the power supply ground line.

[0013] In an embodiment of the present invention, the first electrolytic capacitor is greater than or equal to 3300uF; and / or the second electrolytic capacitor is greater than or equal to 3300uF.

[0014] In an embodiment of the present invention, the charger comprises a voltage output terminal; when the charger is in a standby state, the output voltage of the voltage output terminal is 3 to 5.5V.

[0015] In an embodiment of the present invention, the communication unit includes a control module, and the control module is used to control the voltage outputted by the voltage output terminal to be 3-5.5V when the charger is in a standby state.

[0016] In an embodiment of the present utility model, the charging current sampling module includes a second resistor and a third resistor connected in parallel with each other; wherein one end of the second resistor and the third resistor is connected to the power supply ground line.

[0017] In an embodiment of the present utility model, the discharge current sampling module includes a first resistor and a fourth resistor connected in parallel; wherein one end of the first resistor and the fourth resistor is connected to the other end of the second resistor and the third resistor.

[0018] In an embodiment of the present invention, the connected ends of the first resistor, the fourth resistor, the second resistor and the third resistor are commonly connected to the display ground line and the control ground line.

[0019] In a second aspect, an embodiment of the present invention provides a digital lithium battery charging device, comprising the digital lithium battery charger described above.

[0020] A digital lithium battery charger and device provided by the embodiment of the utility model reduces photoelectric isolation and ensures that the ground wire of each charger control chip and the ground wire of the battery load are completely grounded at one point by using a one-point power supply technology, thereby preventing interference with the ground supply due to high-power charging current sampling, greatly reducing costs; adopts a centralized display power supply method to integrate the power supply of the display unit and the power supply of the communication unit without increasing costs, thereby facilitating production, not increasing the complexity of the power supply system, reducing the power consumption of the entire machine, and saving electric energy; and adds a large-capacity output electrolytic capacitor to effectively increase the effective service life of the digital battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1Shown is a structural schematic diagram of a ground line connection of a digital lithium battery charger provided by an embodiment of the utility model.

[0022] Figure 2 Shown is a structural schematic diagram of a digital lithium battery charger power line connection provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] This embodiment provides a digital lithium battery charger, such as Figure 1 and Figure 2 As shown, the digital lithium battery charger includes a display unit, a display power supply unit, and a communication unit. The display unit includes a display ground wire; the display power supply unit includes a power supply ground wire, a charging current sampling module, and a discharging current sampling module; the first end of the charging current sampling module is connected to the power supply ground wire; the communication unit includes a control ground wire; the power supply ground wire and the control ground wire are not connected; the second end of the charging current sampling module, the third end of the discharging current sampling module, the display ground wire, and the control ground wire are connected to the same ground.

[0025] Specifically, the second end of the charging current sampling module and the third end of the discharging current sampling module are connected to form a battery ground line. The battery ground line and the control ground line are strictly distinguished on the schematic diagram. When actually wiring, wiring according to the principle can ensure that the two have only one common ground (RJ4), and are strictly distinguished from the power supply ground line, so that the current interference in the charger charging current sampling and the discharge current sampling will not have any effect on the control. The use of one-point power supply technology is implemented through this embodiment to ensure that the ground line of each charger control chip and the ground line of the battery load are completely common to one point, and will not be interfered with the ground supply due to high-power charging current sampling.

[0026] In an embodiment of the present invention, the display unit includes a display power supply terminal; the communication unit includes a communication power supply terminal; the display power supply terminal includes a power supply terminal; the display power supply terminal and the communication power supply terminal are connected to the power supply terminal. Optionally, the output voltage of the power supply terminal is 5V.

[0027] Specifically, in this embodiment, the display unit and the communication unit are jointly powered by the power supply terminal. The centralized display power supply does not increase the cost, because the system itself requires an external communication unit, and this communication unit itself needs power supply, so the power supply of the display unit and the power supply of the communication unit are integrated.

[0028] In one embodiment of the utility model, the display power supply unit includes a first electrolytic capacitor CD1 and a second electrolytic capacitor CD2; the negative electrode of the first electrolytic capacitor CD1 is connected to the second end of the charging current sampling module; the negative electrode of the second electrolytic capacitor CD2 is connected to the power supply ground line. Optionally, the first electrolytic capacitor CD1 is greater than or equal to 3300uF; and / or, the second electrolytic capacitor CD2 is greater than or equal to 3300uF. This embodiment ensures that charging interference is minimized by adding a large-capacity output electrolytic capacitor.

[0029] In one embodiment of the utility model, the charger includes a voltage output terminal; when the charger is in a standby state, the output voltage of the voltage output terminal is 3 to 5.5 V. The communication unit includes a control module, and the control module is used to control the voltage output of the voltage output terminal to be 3 to 5.5 V when the charger is in a standby state.

[0030] Adding large-capacity output electrolytic capacitors ensures that charging interference is minimized, but at the same time, due to the large electrolytic output, there will be a large discharge and charging process before the load battery, causing the battery to short-circuit protection once. This is handled by software (control module) to ensure that the output voltage in standby mode is 3-5V, because the voltage of a general lithium battery is above 6V. In this way, the voltage difference between the battery and the capacitor is only about 3-5.5V. If the standby voltage is 0V, the voltage difference between the battery and the capacitor at the moment of power-on is at least 6V. The higher the voltage, the greater the voltage difference. The charging current of the large electrolytic capacitor is very large at the moment of power-on, which can easily cause the battery output to short-circuit protection with a large current. This will affect the battery performance for a long time.

[0031] In one embodiment of the utility model, the charging current sampling module includes a second resistor KT2 and a third resistor KT3 connected in parallel; wherein one end of the second resistor KT2 and the third resistor KT3 are connected to the power supply ground line. The discharging current sampling module includes a first resistor KT1 and a fourth resistor KT4 connected in parallel; wherein one end of the first resistor KT1 and the fourth resistor KT4 are connected to the other end of the second resistor KT2 and the third resistor KT3. The connected ends of the first resistor KT1, the fourth resistor KT4, the second resistor KT2 and the third resistor KT3 are connected to the display ground line and the control ground line.

[0032] This embodiment provides a digital lithium battery charging device, which includes the digital lithium battery charger described above.

[0033] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0034] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0035] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0036] The block diagrams of devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems may be connected, arranged, and configured in any manner.

[0037] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0038] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0039] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0040] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The above is only a preferred embodiment of the utility model, and it is not intended to limit the utility model. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A digital lithium battery charger, characterized in that: include: A display unit, including a display ground line; A display power supply unit includes a power supply ground wire, a charging current sampling module and a discharging current sampling module; The first end of the charging current sampling module is connected to the power supply ground line; a communication unit, including a control ground; Among them, the power supply ground line and the control ground line are not connected; the second end of the charging current sampling module, the third end of the discharging current sampling module, the display ground line and the control ground line are connected to the same ground.

2. The digital lithium battery charger according to claim 1, characterized in that: The display unit includes a display power supply terminal; the communication unit includes a communication power supply terminal; the display power supply terminal includes a power supply terminal; the display power supply terminal and the communication power supply terminal are commonly connected to the power supply terminal.

3. The digital lithium battery charger according to claim 2, characterized in that: The output voltage of the power supply end is 5V.

4. The digital lithium battery charger according to claim 1, characterized in that: The display power supply unit includes a first electrolytic capacitor and a second electrolytic capacitor; the cathode of the first electrolytic capacitor is connected to the second end of the charging current sampling module; and the cathode of the second electrolytic capacitor is connected to the power supply ground line.

5. The digital lithium battery charger according to claim 4, characterized in that: The first electrolytic capacitor is greater than or equal to 3300uF; and / or the second electrolytic capacitor is greater than or equal to 3300uF.

6. The digital lithium battery charger according to claim 1, characterized in that: The charger comprises a voltage output terminal; when the charger is in a standby state, the output voltage of the voltage output terminal is 3 to 5.5V.

7. The digital lithium battery charger according to claim 6, characterized in that: The communication unit includes a control module, and the control module is used to control the voltage outputted by the voltage output terminal to be 3-5.5V when the charger is in a standby state.

8. The digital lithium battery charger according to claim 1, characterized in that: The charging current sampling module comprises a second resistor and a third resistor connected in parallel with each other; wherein one end of the second resistor and the third resistor is connected to the power supply ground line; and / or The discharge current sampling module includes a first resistor and a fourth resistor connected in parallel with each other; One end of the first resistor and the fourth resistor is connected to the other end of the second resistor and the third resistor.

9. The digital lithium battery charger according to claim 8, characterized in that: The connected ends of the first resistor, the fourth resistor, the second resistor and the third resistor are commonly connected to the display ground line and the control ground line.

10. A digital lithium battery charging device, characterized in that: A digital lithium battery charger comprising any one of claims 1 to 9.

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