Lithium battery charging system capable of switching batteries in two paths

Abstract

The utility model relates to the technical field of charging systems, in particular to a lithium battery charging system with a double-circuit battery changing function. A bridge rectifier module is connected to an alternating current input end, a PFC module is connected to the bridge rectifier module and an LLC circuit module, and a control module is electrically connected with the PFC module, the LLC circuit module and a relay module. The LLC circuit module comprises a first LLC power supply circuit and a second LLC power supply circuit, the first LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module, and the second LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module. When alternating current is input, the alternating current is converted into direct current voltage through the bridge rectifier module, the direct current voltage is boosted through the PFC module and then supplied to the LLC circuit module for use, the LLC circuit module adopts a double-LLC power supply circuit design, single-path and double-path lithium battery charging can be achieved, or two paths of power are combined and one path of power is output, and dynamic power adjustment can be achieved when the two paths of power are independently output. The device can adapt to batteries with different voltage sections.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging systems, in particular to a lithium battery charging system with double-way battery replacement. BACKGROUND

[0002] Nowadays, electric bicycles are widely distributed in various regions of China, and as a means of transportation, they not only provide convenience for daily travel, but are also widely used in the delivery and express delivery industries, thereby having a huge demand for charging and battery replacement. In order to meet this demand, battery replacement cabinets have emerged. The battery replacement cabinet can not only store a certain number of lithium batteries, but also has a built-in charging function. Users can put batteries with depleted power into the battery replacement cabinet and then take out batteries that have been fully charged, without the need to stop and wait for charging, so as to achieve immediate replacement and walking.

[0003] The traditional battery replacement cabinet includes a plurality of battery compartments for storing lithium batteries. Each battery compartment is configured with a charging output circuit, and the charging output circuit of each battery compartment is independent, and the start and stop are independently controlled by the cabinet control module, so that double-way parallel output cannot be achieved. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the application provides a lithium battery charging system with double-way battery replacement, which comprises a rectifier bridge stack module, a PFC power correction module, an LLC circuit module, a relay module, a first output circuit, a second output circuit and a control module. The rectifier bridge stack module is connected to an AC input end, the PFC power correction module is connected to the rectifier bridge stack module and the LLC circuit module respectively, and the control module is electrically connected with the PFC power correction module, the LLC circuit module and the relay module. The LLC circuit module comprises a first LLC power supply circuit and a second LLC power supply circuit, the first LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module, and the second LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module.

[0005] Preferably, a rectifier module is connected between the LLC circuit module and the relay module.

[0006] Preferably, the relay module comprises switches S1, S2, S3 and S4, the first LLC power supply circuit is connected to the first output circuit through the switch S1, and the first LLC power supply circuit is connected to the second output circuit through the switch S2; the second LLC power supply circuit is connected to the first output circuit through the switch S3, and the second LLC power supply circuit is connected to the second output circuit through the switch S4.

[0007] Preferably, an auxiliary power supply is further included, which is connected to the PFC power correction module, and is used to supply power to the control module.

[0008] Preferably, the control module includes a first MCU module and a second MCU module, the first MCU module is connected to the PFC power correction module and the LLC circuit module through a PFC enable and an LCC power supply module; and the second MCU module is connected to the LLC circuit module through an isolation driving chip.

[0009] Preferably, the first MCU module and the second MCU module are respectively connected to the auxiliary power supply through a voltage stabilizer.

[0010] Preferably, the first MCU module and the second MCU module are communicatively connected through a serial communication module.

[0011] Preferably, an EMI device is further included, and the rectifier bridge stack module is connected to the AC input end through the EMI device.

[0012] As can be seen from the above, the following beneficial effects can be obtained by applying the present application: the rectifier bridge stack module is connected to the AC input end, the PFC power correction module is respectively connected to the rectifier bridge stack module and the LLC circuit module, the control module is electrically connected with the PFC power correction module, the LLC circuit module and the relay module; the LLC circuit module includes a first LLC power supply circuit and a second LLC power supply circuit, the first LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module, and the second LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module. When the AC power is input, the rectifier bridge stack module converts the AC power into DC voltage, the DC voltage is boosted by the PFC power correction module and then supplied to the LLC circuit module, the LLC circuit module adopts a double-LLC power supply circuit design, and single-path, double-path lithium battery charging or two-path power merging one-path output can be realized. When two paths are independently output, power dynamic adjustment can be realized, and different voltage segment batteries can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are only part of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 The schematic diagram of the lithium battery charging system with double-path battery replacement in the embodiments of the present application. DETAILED DESCRIPTION

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] To address the aforementioned technical problems, this embodiment provides a dual-path battery swapping lithium battery charging system, such as... Figure 1 As shown, the system includes a rectifier bridge module, a PFC power correction module, an LLC circuit module, a relay module, a first output circuit, a second output circuit, and a control module. The rectifier bridge module is connected to the AC input terminal. The PFC power correction module is connected to both the rectifier bridge module and the LLC circuit module. The control module is electrically connected to the PFC power correction module, the LLC circuit module, and the relay module. The LLC circuit module includes a first LLC power supply circuit and a second LLC power supply circuit. The first LLC power supply circuit is connected to both the first and second output circuits via the relay module, and the second LLC power supply circuit is connected to both the first and second output circuits via the relay module. When AC power is input, it is converted to DC voltage by the rectifier bridge module. The DC voltage is then boosted by the PFC power correction module and supplied to the LLC circuit module. The LLC circuit module adopts a dual LLC power supply circuit design, which can realize single-channel or dual-channel lithium battery charging, or combine the power of two channels into one output. When the two channels are output separately, dynamic power adjustment can be achieved to adapt to batteries of different voltage ranges.

[0017] Specifically, this also includes EMI devices and fuses. The rectifier bridge module is connected to the AC input terminal via EMI devices and fuses. When the charger inputs 90-264V AC power, the EMI devices effectively reduce the impact of electromagnetic interference on the electronic equipment, improving power quality and stability. The power is then converted to DC voltage by the rectifier bridge module, and then boosted to 380V by the PFC controller to supply the LLC circuit module. Furthermore, a rectifier module is connected between the LLC circuit module and the relay module. The DC voltage is rectified by the rectifier module before being supplied to the first and second output circuits.

[0018] The above solution also includes an auxiliary power supply, which is connected to the PFC power correction module and is used to power the control module. The DC voltage is boosted by the PFC controller, with one path supplying the LLC circuit module and the other path generating 12V through the auxiliary power supply, which is then converted to 5V to power the control module.

[0019] Further, the control module is electrically connected with the relay module, the relay module includes switches S1, S2, S3 and S4, the first LLC power supply circuit is connected to the first output circuit through the switch S1, the first LLC power supply circuit is connected to the second output circuit through the switch S2; the second LLC power supply circuit is connected to the first output circuit through the switch S3, and the second LLC power supply circuit is connected to the second output circuit through the switch S4. Specifically, when the switch S1 is closed, the first LLC power supply circuit outputs voltage to the first output circuit, when the switch S4 is closed, the second LLC power supply circuit outputs voltage to the second output circuit; when the switch S1 and the switch S3 are closed, the first LLC power supply circuit and the second LLC power supply circuit are combined to output voltage to the first output circuit, and when the switch S2 and the switch S4 are closed, the first LLC power supply circuit and the second LLC power supply circuit are combined to output voltage to the second output circuit. Further, by controlling the opening and closing of the switches S1, S2, S3 and S4, the first output circuit and the second output circuit are controlled to output individually or combined, so as to realize single-path and double-path lithium battery charging, and the single-path or double-path output can be flexibly adjusted according to actual working conditions.

[0020] Further, the control module includes a PFC enablement and LCC power supply module, a first MCU module and a second MCU module, the first MCU module is connected to the PFC power correction module and the LLC circuit module through the PFC enablement and LCC power supply module, and the PFC enablement and LCC power supply module is used for powering the PFC power correction module and the LLC circuit module to operate; the first MCU module and the second MCU module are connected in communication through a serial communication module. The second MCU module is connected to the LLC circuit module through an isolation driving chip. The first MCU module and the second MCU module are connected to an auxiliary power supply through a voltage stabilizer respectively. The auxiliary power supply delivers 5V voltage to the first MCU module and the second MCU module for power supply. Among them, the second MCU module is a main control module, which is used for controlling the whole system to operate. The first MCU module mainly plays a detection role, such as AC input voltage detection, PFC voltage detection, temperature detection, and the first MCU module controls the enablement of the PFC power correction module and powers the LCC circuit module to operate.

[0021] For example, when the user puts the battery that needs to be replaced into the empty battery compartment of the battery replacement cabinet, the battery replacement cabinet can detect the state information of the current battery through the communication module. When the second MCU module detects that the battery is connected, the second MCU module transmits a signal to the first MCU module through the serial communication module. After the first MCU module receives the charging signal, the first MCU module controls the LLC circuit module to output a voltage to the first output circuit or the second output circuit, so as to charge the battery connected to the first output circuit or the second output circuit. When only one output circuit requests charging, the first output circuit and the second output circuit are automatically connected in parallel through the opening and closing of the relay module, the power of the two output circuits is combined into one path, and the maximum power is output for charging. When another output circuit is detected to be connected to the battery, the control module controls the relay module to open and close, so that the first output circuit and the second output circuit output voltages separately, and then charge the two batteries respectively.

[0022] Further, the maximum power charging principle is that the first output circuit Po1+ the second output circuit Po2≦ the overall power. When the first output circuit enters charging first, Vo1XI o1≦ the single-path maximum power, and Vo2XI o2=the overall power-Vo1XI o1≦ the single-path maximum power. When the second output circuit enters charging first, Vo2XIo2≦ the single-path maximum power, and Vo1XI o1=the overall power-Vo2XIo2≦ the single-path maximum power. Therefore, when two paths output separately, power dynamic adjustment can be realized, and batteries of different voltage segments (such as 48V, 60V, and 72V) can be adapted.

[0023] In summary, in the scheme, the rectifier bridge stack module is connected to the AC input end, the PFC power correction module is connected to the rectifier bridge stack module and the LLC circuit module respectively, and the control module is electrically connected with the PFC power correction module, the LLC circuit module, and the relay module. The LLC circuit module includes a first LLC power supply circuit and a second LLC power supply circuit. The first LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module, and the second LLC power supply circuit is connected to the first output circuit and the second output circuit through the relay module. When AC power is input, the rectifier bridge stack module converts it into DC voltage, the PFC power correction module boosts the DC voltage, and the LLC circuit module uses the boosted DC voltage. The LLC circuit module adopts a double-LLC power supply circuit design, can realize single-path and double-path lithium battery charging, or two-path power combination one-path output, and can realize power dynamic adjustment when two paths output separately, and can adapt to different voltage segment batteries.

[0024] The above-described embodiments do not constitute a limitation on the protection scope of the technical scheme. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments shall be included in the protection scope of the technical scheme.

Claims

1. A dual-path battery swapping lithium battery charging system, characterized in that: The system includes a rectifier bridge module, a PFC power correction module, an LLC circuit module, a relay module, a first output circuit, a second output circuit, and a control module. The rectifier bridge module is connected to the AC input terminal. The PFC power correction module is connected to both the rectifier bridge module and the LLC circuit module. The control module is electrically connected to the PFC power correction module, the LLC circuit module, and the relay module. The LLC circuit module includes a first LLC power supply circuit and a second LLC power supply circuit. The first LLC power supply circuit is connected to both the first and second output circuits via the relay module. The second LLC power supply circuit is connected to both the first and second output circuits via the relay module.

2. The lithium battery charging system with dual-path battery swapping according to claim 1, characterized in that: A rectifier module is connected between the LLC circuit module and the relay module.

3. The lithium battery charging system with dual-path battery swapping according to claim 2, characterized in that: The relay module includes switches S1, S2, S3, and S4. The first LLC power supply circuit is connected to the first output circuit through switch S1, and the first LLC power supply circuit is connected to the second output circuit through switch S2. The second LLC power supply circuit is connected to the first output circuit through switch S3, and the second LLC power supply circuit is connected to the second output circuit through switch S4.

4. The lithium battery charging system with dual-path battery swapping according to claim 1, characterized in that: It also includes an auxiliary power supply, which is connected to the PFC power correction module and is used to power the control module.

5. The lithium battery charging system with dual-path battery swapping according to claim 4, characterized in that: The control module includes a first MCU module and a second MCU module. The first MCU module is connected to the PFC power correction module and the LLC circuit module via PFC enable and LCC power supply module. The second MCU module is connected to the LLC circuit module via an isolation driver chip.

6. The lithium battery charging system with dual-path battery swapping according to claim 5, characterized in that: The first MCU module and the second MCU module are respectively connected to the auxiliary power supply through voltage regulators.

7. The lithium battery charging system with dual-path battery swapping according to claim 5, characterized in that: The first MCU module and the second MCU module communicate with each other through a serial communication module.

8. The lithium battery charging system with dual-path battery swapping according to claim 1, characterized in that: It also includes EMI devices, and the rectifier bridge module is connected to the AC input terminal through EMI devices.

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