Two-way output lithium ion battery charger
By designing a dual-output lithium-ion battery charger, using a power converter and separation device, combining AD conversion circuit and controller, the problem of lithium-ion battery charger only being output in the existing technology is solved, and multiple implementations have been achieved. The efficient charging and ease of use of lithium-ion batteries reduce costs.
Patent Information
- Application Number
- CN202421034733.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The existing lithium-ion battery chargers only have one output, and cannot efficiently charge multiple sets of lithium-ion batteries at the same time, resulting in slow charging efficiency, inconvenient use and high cost.
A dual-output lithium-ion battery charger is designed. Through the combination of power converter, separation device and output plug, AD conversion circuit, controller and power drive circuit are used to combine diodes, resistors and transistors to achieve circuit isolation and charging. Control to ensure that both lithium-ion batteries are charged simultaneously.
The circuit isolation of dual outputs is realized, the charging efficiency of multiple sets of lithium-ion batteries is improved, the use process is simplified, and the cost is reduced.
Smart Images
Figure CN222262227U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery management, and in particular to a dual-channel output lithium-ion battery charger. Background Art
[0002] Lithium-ion battery is a secondary battery (rechargeable battery), and its working principle mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to realize the charging and discharging process. When charging, lithium ions are deintercalated from the positive electrode and embedded into the negative electrode through the electrolyte, making the negative electrode in a lithium-rich state; while when discharging, the process is reversed. Lithium-ion batteries have been widely used in electronic products, electric vehicles and other fields due to their high energy density, long cycle life and environmental protection.
[0003] Lithium-ion battery charger is a device that charges lithium-ion batteries. Its working principle is to use electric current to move lithium ions from the negative electrode to the positive electrode, thereby charging the lithium battery. The charger contains a DC power supply that can convert AC power into DC power and has the functions of current control and voltage control. Lithium-ion battery charger is a charging device that is widely used in modern society. Generally, conventional battery chargers have only one output plug and can only charge one battery pack. If multiple battery packs are charged at the same time, multiple chargers are required, which has slow charging efficiency, is extremely inconvenient to use, and is costly. Utility Model Content
[0004] The utility model provides a dual-output battery charger, which solves the technical problems of low charging efficiency, inconvenience in use and high cost for charging multiple groups of lithium-ion batteries in the prior art.
[0005] The technical solution of the utility model is as follows:
[0006] A dual-output lithium-ion battery charger comprises a power converter, a separation device, a first output plug and a second output plug connected in sequence, wherein the power converter and the separation device are respectively provided with circuit boards, the power converter circuit board comprises an AD conversion circuit, a controller and a power drive circuit, the separation device circuit board comprises a separation circuit, the input end of the separation circuit is connected to the output end of the power drive circuit, and the output end of the separation circuit is respectively connected to a lithium-ion battery through the first output plug and the second output plug.
[0007] Further, the separation circuit includes a diode D1, a diode D2 and a resistor R5, the anode of the diode D1 is connected to the first output end of the power driving circuit, the cathode of the diode D1 is electrically connected to the first output plug, the anode of the diode D2 is connected to the first output end of the power driving circuit, the cathode of the diode D2 is electrically connected to the second output plug, the first end of the resistor R5 is electrically connected to the first output plug, the first end of the resistor R5 is electrically connected to the second output plug, the second end of the resistor R5 is connected to the second output end of the power driving circuit, and the second end of the resistor R5 is grounded.
[0008] Furthermore, the power drive circuit includes a switch tube Q1, a transistor Q2 and a diode D3, the drain of the switch tube Q1 is connected to the first output end of the AD conversion circuit through the diode D3, the source of the switch tube Q1 serves as the first output end of the power drive circuit, the gate of the switch tube Q1 is connected to the collector of the transistor Q2 through a resistor R2, the base of the transistor Q2 is connected to the controller through a resistor R3, the emitter of the transistor Q2 is connected to the second output end of the AD conversion circuit, and the emitter of the transistor Q2 is grounded.
[0009] Furthermore, the separation device circuit board also includes a resistor R6 and a capacitor C1, the first end of the resistor R6 is connected to the controller, the second end of the resistor R6 is connected to the first end of the resistor R5, and the second end of the resistor R6 is also grounded through the capacitor C1.
[0010] Furthermore, the power drive circuit also includes a transistor Q3, a resistor R7 and a resistor R8, the first end of the resistor R7 is connected to the first output end of the AD conversion circuit, the second end of the resistor R7 is connected to the second output end of the AD conversion circuit through the resistor R8, the first end of the resistor R7 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the controller.
[0011] The working principle and beneficial effects of the utility model are:
[0012] In the utility model, the separation device is led out from the output end of the power converter, the first output plug and the second output plug are led out from the output end of the separation device, the separation device realizes physical isolation, and the circuit isolation of the dual output is realized by the separation circuit on the circuit board of the separation device. The mains electricity passes through the AD conversion circuit, the power drive circuit and the separation circuit in sequence, and finally charges the two lithium-ion batteries respectively by means of the first output plug 3 and the second output plug 4.
[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the lithium-ion battery charger in the utility model;
[0015] Figure 2 It is a circuit principle diagram of the separation circuit in the utility model;
[0016] Figure 3 It is a circuit schematic diagram of the power drive circuit in the utility model;
[0017] In the accompanying drawings, 1: power converter, 2: separation device, 3: first output plug, 4: second output plug. DETAILED DESCRIPTION
[0018] The following will be combined with 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.
[0019] Example 1
[0020] Figure 1 The schematic diagram of the structure of the lithium-ion battery charger in the utility model is as follows: Figure 1 As shown, this embodiment proposes a dual-output lithium-ion battery charger, including a power converter 1, a separation device 2, a first output plug 3 and a second output plug 4 connected in sequence, the power converter 1 and the separation device 2 are respectively provided with circuit boards, the power converter circuit board includes an AD conversion circuit, a controller and a power drive circuit, the separation device circuit board includes a separation circuit, the input end of the separation circuit is connected to the output end of the power drive circuit, and the output end of the separation circuit is connected to the lithium-ion battery through the first output plug 3 and the second output plug 4.
[0021] In this embodiment, the separation device 2 is led out from the output end of the power converter 1, and the first output plug 3 and the second output plug 4 are led out from the output end of the separation device 2. The separation device 2 is made of PVC injection molding to achieve physical isolation, and the circuit isolation of the dual-channel output is achieved through the separation circuit on the separation device circuit board. The AD conversion circuit is used to convert AC power into DC power. The controller uses a single-chip microcomputer to control the operation of the power drive circuit to ensure charging safety. The power drive circuit is used to charge the lithium-ion battery in the process of trickle charging, constant current charging, and constant voltage charging under the action of the controller. The power converter 1 is also equipped with an input plug for connecting the mains. The mains passes through the AD conversion circuit, the power drive circuit and the separation circuit in sequence with the help of the input plug, and finally charges the two lithium-ion batteries respectively with the help of the first output plug 3 and the second output plug 4.
[0022] further, Figure 2 The schematic diagram of the separation circuit in the utility model is shown in FIG. Figure 2 As shown, the separation circuit includes a diode D1, a diode D2 and a resistor R5, the anode of the diode D1 is connected to the first output end of the power driving circuit, the cathode of the diode D1 is electrically connected to the first output plug 3, the anode of the diode D2 is connected to the first output end of the power driving circuit, the cathode of the diode D2 is electrically connected to the second output plug 4, the first end of the resistor R5 is electrically connected to the first output plug 3, the first end of the resistor R5 is electrically connected to the second output plug 4, the second end of the resistor R5 is connected to the second output end of the power driving circuit, and the second end of the resistor R5 is grounded.
[0023] In this embodiment, the resistor R5 is a sampling resistor, which is used to enable the controller to control the charging state. The lithium-ion battery B1 and the lithium-ion battery B2 are charged respectively through the diode D1 and the diode D2 in the separation circuit. Under normal circumstances, when the input plug is inserted into the mains and the lithium-ion batteries B1 and B2 are charged, there are the following three situations.
[0024] 1. The voltage of lithium-ion battery B1 is equal to the voltage of lithium-ion battery B2
[0025] After the mains is connected, diodes D1 and D2 are turned on at the same time, and 0.5IO of the output current IO passes through diode D1 to reach the positive electrode of lithium-ion battery B1, then flows out from the negative electrode of lithium-ion battery B1 and flows back to the second output terminal of the power drive circuit, completing the charging of lithium-ion battery B1, and the charging voltage is Vb1; the other 0.5IO passes through diode D2 to reach the positive electrode of lithium-ion battery B2, then flows out from the negative electrode of lithium-ion battery B2 and flows back to the second output terminal of the power drive circuit, completing the charging of lithium-ion battery B2, and the charging voltage is Vb2. After a period of time, the above process is completed, and the two lithium-ion batteries B1 and B2 are fully charged at the same time.
[0026] 2. The voltage of lithium-ion battery B1 is greater than the voltage of lithium-ion battery B2
[0027] After the mains is connected, the diode D1 is reversely cut off, the diode D2 is turned on, no current flows through the lithium-ion battery B1, and the lithium-ion battery B1 is not charged at this time. The output current IO passes through the diode D2 to reach the positive electrode of the lithium-ion battery B2, and then flows out from the negative electrode of the lithium-ion battery B2 and flows back to the second output terminal of the power drive circuit to start charging the lithium-ion battery B2. At this time, the voltage of the lithium-ion battery B2 gradually rises as the charging progresses until it is equal to the voltage of the lithium-ion battery B1, and then continues to charge according to the first case.
[0028] 3. The voltage of lithium-ion battery B1 is lower than that of lithium-ion battery B2
[0029] After the mains is connected, the diode D2 is reversely cut off, the diode D1 is turned on, no current flows through the lithium-ion battery B2, and the lithium-ion battery B2 is not charged at this time. The output current IO passes through the diode D1 to reach the positive electrode of the lithium-ion battery B1, and then flows out from the negative electrode of the lithium-ion battery B1 and flows back to the second output terminal of the power drive circuit to start charging the lithium-ion battery B1. At this time, the voltage of the lithium-ion battery B1 gradually rises as the charging progresses until it is equal to the voltage of the lithium-ion battery B2, and then continues to charge according to the first case.
[0030] further, Figure 3 The schematic diagram of the power drive circuit in the utility model is shown in FIG. Figure 3 As shown, the power drive circuit includes a switch tube Q1, a transistor Q2 and a diode D3. The drain of the switch tube Q1 is connected to the first output end of the AD conversion circuit through the diode D3. The source of the switch tube Q1 serves as the first output end of the power drive circuit. The gate of the switch tube Q1 is connected to the collector of the transistor Q2 through the resistor R2. The base of the transistor Q2 is connected to the controller through the resistor R3. The emitter of the transistor Q2 is connected to the second output end of the AD conversion circuit. The emitter of the transistor Q2 is grounded.
[0031] In this embodiment, the PWM signal output by the controller drives the switch of the transistor Q2, and further drives the switch of the switch tube Q1, so as to control the charging state.
[0032] Further, if Figure 2 As shown, the separation device circuit board also includes a resistor R6 and a capacitor C1, a first end of the resistor R6 is connected to the controller, a second end of the resistor R6 is connected to a first end of the resistor R5, and a second end of the resistor R6 is also grounded through the capacitor C1.
[0033] In this embodiment, the controller obtains the average charging current by sampling the voltage drop of the resistor R5 , and the resistor R6 and the capacitor C1 form an RC hardware filter circuit to make the signal reaching the controller smoother.
[0034] Further, if Figure 3 As shown, the power drive circuit also includes a transistor Q3, a resistor R7 and a resistor R8, the first end of the resistor R7 is connected to the first output end of the AD conversion circuit, the second end of the resistor R7 is connected to the second output end of the AD conversion circuit through the resistor R8, the first end of the resistor R7 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the controller.
[0035] In this embodiment, resistors R7 and R8 drive transistor Q3, and the signal output by the collector of transistor Q3 is connected to the controller IO port and set as the input internal pull-up. When the mains is connected, transistor Q3 is turned on, the output signal is low level, and the whole machine wakes up and enters the charging state. When the mains is disconnected, transistor Q3 is turned off, the output signal is high level, and the whole machine enters the sleep mode to save battery power consumption.
[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A dual-output lithium-ion battery charger, characterized in that: The invention comprises a power converter (1), a separation device (2), a first output plug (3) and a second output plug (4) which are connected in sequence, wherein the power converter (1) and the separation device (2) are respectively provided with circuit boards, the power converter circuit board comprises an AD conversion circuit, a controller and a power drive circuit, the separation device circuit board comprises a separation circuit, the input end of the separation circuit is connected to the output end of the power drive circuit, and the output end of the separation circuit is respectively connected to a lithium-ion battery via the first output plug (3) and the second output plug (4).
2. A dual-output lithium-ion battery charger according to claim 1, characterized in that: The separation circuit comprises a diode D1, a diode D2 and a resistor R5, wherein the anode of the diode D1 is connected to the first output end of the power drive circuit, the cathode of the diode D1 is electrically connected to the first output plug (3), the anode of the diode D2 is connected to the first output end of the power drive circuit, the cathode of the diode D2 is electrically connected to the second output plug (4), the first end of the resistor R5 is electrically connected to the first output plug (3), the first end of the resistor R5 is electrically connected to the second output plug (4), the second end of the resistor R5 is connected to the second output end of the power drive circuit, and the second end of the resistor R5 is grounded.
3. A dual-output lithium-ion battery charger according to claim 1, characterized in that: The power drive circuit includes a switch tube Q1, a transistor Q2 and a diode D3. The drain of the switch tube Q1 is connected to the first output end of the AD conversion circuit through the diode D3. The source of the switch tube Q1 serves as the first output end of the power drive circuit. The gate of the switch tube Q1 is connected to the collector of the transistor Q2 through a resistor R2. The base of the transistor Q2 is connected to the controller through a resistor R3. The emitter of the transistor Q2 is connected to the second output end of the AD conversion circuit. The emitter of the transistor Q2 is grounded.
4. A dual-output lithium-ion battery charger according to claim 1, characterized in that: The separation device circuit board also includes a resistor R6 and a capacitor C1. The first end of the resistor R6 is connected to the controller, the second end of the resistor R6 is connected to the first end of the resistor R5, and the second end of the resistor R6 is also grounded through the capacitor C1.
5. A dual-output lithium-ion battery charger according to claim 1, characterized in that: The power drive circuit also includes a transistor Q3, a resistor R7 and a resistor R8, the first end of the resistor R7 is connected to the first output end of the AD conversion circuit, the second end of the resistor R7 is connected to the second output end of the AD conversion circuit through the resistor R8, the first end of the resistor R7 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the controller.