CN210123902U

CN210123902U - Be applied to two-way DC-DC converter of lithium cell charge-discharge management

Info

Publication number: CN210123902U
Application number: CN201921374545.3U
Authority: CN
Inventors: 冯宏伟; 孙晓艳; 栗小宽
Original assignee: Wuxi Institute of Technology
Current assignee: Wuxi Institute of Technology
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-03-03
Anticipated expiration: 2029-08-22

Abstract

The utility model discloses a be applied to two-way DC-DC converter of lithium cell charge-discharge management, including two-way half-bridge converting circuit, MCU control module, current/voltage acquisition module, constant current drive module, lithium cell group and direct current constant voltage power supply. The utility model discloses use two-way half-bridge circuit as main topological structure to the minimum system board of singlechip is control core, coordinates the two-way DC-DC converter design of each module work in order to realize lithium battery charge and discharge management. The utility model discloses can carry out real time monitoring to voltage, the electric current among the lithium cell charge-discharge process and adjust. Meanwhile, the discharge energy is recycled, so that energy waste is avoided, and the energy utilization efficiency in the lithium battery formation process is greatly improved.

Description

Be applied to two-way DC-DC converter of lithium cell charge-discharge management

Technical Field

The utility model belongs to the technical field of the converter, concretely relates to be applied to two-way DC-DC converter of lithium cell charge and discharge management.

Background

At present, domestic lithium battery formation equipment mainly charges a battery through a charging power supply, and energy inside the lithium battery is consumed on a resistor in a parallel resistor mode during discharging. Although the formation method has simple equipment structure and low cost, a large amount of energy is wasted, and therefore, a bidirectional DC-DC converter with large current and adjustable output voltage is urgently needed.

SUMMERY OF THE UTILITY MODEL

To the problem that above-mentioned prior art exists, the utility model provides a be applied to two-way DC-DC converter of lithium cell charge and discharge management can realize having avoided the energy waste, improves the converter of the lithium cellization becomes the energy utilization efficiency of in-process.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a be applied to two-way DC-DC converter of lithium cell charge-discharge management, includes two-way half-bridge converting circuit, MCU control module, current/voltage acquisition module, constant current drive module, lithium cell group and direct current constant voltage power supply, two-way half-bridge converting circuit output is organized with the lithium cell, direct current constant voltage power supply and current/voltage acquisition module input electricity is connected, the output of lithium cell group and direct current constant voltage power supply is connected with the input electricity of two-way half-bridge swivel circuit, current/voltage acquisition module output is connected with MCU control module input electricity, MCU control module output is connected with constant current drive input electricity, the constant current drive output is connected with two-way half-bridge converting circuit input electricity.

Preferably, the lithium battery pack is formed by connecting five lithium ion batteries of 18650 types with the capacity of 2000mAh in series, and the lithium battery pack is connected with the bidirectional half-bridge conversion circuit through a P2 interface.

Preferably, the power model of the direct current stabilized power supply is TPR 3005-2D.

Preferably, the voltage/current acquisition module comprises voltage detection of the lithium battery pack, voltage detection of a direct current voltage-stabilizing source and current detection in the whole loop.

Preferably, the MCU is an embedded processing chip with the model of STM32F103C8V 6.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses use two-way half-bridge circuit as main topological structure to the minimum system board of singlechip is control core, coordinates the two-way DC-DC converter design of each module work in order to realize lithium battery charge and discharge management. The utility model discloses can carry out real time monitoring to voltage, the electric current among the lithium cell charge-discharge process and adjust. Meanwhile, the discharge energy is recycled, so that energy waste is avoided, and the energy utilization efficiency in the lithium battery formation process is greatly improved.

Drawings

FIG. 1 is a block diagram of the overall structure of the present invention;

fig. 2 is an electrical schematic diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b):

as shown in fig. 1 to 2, a bidirectional DC-DC converter for lithium battery charging and discharging management comprises a bidirectional half-bridge conversion circuit, an MCU control module, a current/voltage collection module, a constant current drive module, a lithium battery pack and a DC regulated power supply, wherein an output terminal of the bidirectional half-bridge conversion circuit is electrically connected to input terminals of the lithium battery pack, the DC regulated power supply and the current/voltage collection module, output terminals of the lithium battery pack and the DC regulated power supply are electrically connected to an input terminal of the bidirectional half-bridge loop circuit, an output terminal of the current/voltage collection module is electrically connected to an input terminal of the MCU control module, an output terminal of the MCU control module is electrically connected to a constant current drive input terminal, an output terminal of the constant current drive is electrically connected to an input terminal of the bidirectional half-bridge conversion circuit, and when the, q5 is cut off, and the circuit is a Boost circuit at the moment; when the Buck voltage reducing circuit works reversely, the switching tube Q5 switches to work, the Q2 is cut off, and the circuit is the Buck voltage reducing circuit. L1 is energy storage inductor, C3 and C4 are energy storage capacitors. The constant current drive adopts a half-bridge drive chip IR2104 as a drive chip, and generates PWM which is complementary and has dead time to drive an upper switch tube Q2 and a lower switch tube Q5 of a main circuit respectively. Constant current drive is achieved by two sets of mirror transistors consisting of transistors Q1 and Q3 and Q4 and Q6. The SD terminal of the IR2104 chip is a chip enable terminal, which can control the output of the PWM at the output terminal of the IR 2019.

The lithium battery pack is formed by connecting five 18650 lithium ion batteries with the capacity of 2000mAh in series, and the lithium battery pack is connected with the bidirectional half-bridge conversion circuit through a P2 interface.

The power model of the direct current stabilized power supply is TPR3005-2D, so that the power supply voltage is 24VDC-36VDC adjustable.

The voltage/current acquisition module comprises voltage for detecting the lithium battery pack, voltage of a direct-current voltage-stabilizing source and current detection in the whole loop, and the voltage of the lithium battery pack is subjected to voltage division through two resistors R5 and R8 and then subjected to AD conversion and transmitted to the MCU; the voltage of the direct current voltage stabilizing source is divided by two resistors R1 and R4, then is subjected to AD conversion and is transmitted to the MCU, and the direction of the conversion circuit is controlled or the overvoltage protection operation is carried out. The current detection in the loop is realized by selecting a 200m omega precision resistor R11 to collect voltage, and then transmitting the voltage to the MCU after AD conversion so as to realize the over-current protection of charging and discharging in the circuit.

And the MCU selects an embedded processing chip STM32F103C8V6 with high performance, low cost and low power consumption. The system has the advantages of relatively simple realization, rich self-contained functions, high working speed and the like due to the fact that a program adopts an interface of library function modularization, and realizes PWM and switching signals for driving the IR2104 of the chip to run; and simultaneously, voltage/current detection in the bidirectional conversion circuit is realized.

The utility model discloses use two-way half-bridge circuit as main topological structure to the minimum system board of singlechip is control core, coordinates the two-way DC-DC converter design of each module work in order to realize lithium battery charge and discharge management.

The utility model discloses can carry out real time monitoring to voltage, the electric current among the lithium cell charge-discharge process and adjust. Meanwhile, the discharge energy is recycled, so that energy waste is avoided, and the energy utilization efficiency in the lithium battery formation process is greatly improved.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a be applied to two-way DC-DC converter of lithium cell charge-discharge management which characterized in that: including two-way half-bridge converting circuit, MCU control module, electric current/voltage acquisition module, constant current drive module, lithium cell group and direct current constant voltage power supply, two-way half-bridge converting circuit output is organized with the lithium cell, direct current constant voltage power supply and current/voltage acquisition module input electricity is connected, the output of lithium cell group and direct current constant voltage power supply is connected with the input electricity of two-way half-bridge swivel circuit, current/voltage acquisition module output is connected with MCU control module input electricity, MCU control module output is connected with constant current drive input electricity, constant current drive output is connected with two-way half-bridge converting circuit input electricity.

2. The bi-directional DC-DC converter applied to the charging and discharging management of the lithium battery of claim 1, wherein the lithium battery pack is formed by connecting five lithium ion batteries of 18650 types with a capacity of 2000mAh in series, and the lithium battery pack is connected with the bi-directional half-bridge conversion circuit through a P2 interface.

3. The bidirectional DC-DC converter applied to lithium battery charging and discharging management of claim 2, wherein the DC stabilized power supply is TPR 3005-2D.

4. The bi-directional DC-DC converter applied to lithium battery charging and discharging management as claimed in claim 3, wherein the voltage/current collection module comprises voltage detection of the lithium battery pack, voltage detection of the DC regulator and current detection in the whole loop.

5. The bidirectional DC-DC converter applied to lithium battery charging and discharging management of claim 4, wherein the MCU is an embedded processing chip of STM32F103C8V 6.