1 INTRODUCTION
As an important form of power conversion, DC-DC
converter occupies a very important position in power
system. It is widely used in DC motor drive, UPS, aerospace
power, solar and wind power generation and so on. Buck
converter and boost converter circuit are the most basic
DC-DC converter topology in many topological structures.
Meanwhile, the flyback structure of the DC-DC converter is
also widely used [1].
The mainstream method of designing bidirectional DC-DC
converter is to design the buck circuit and the boost circuit
independently and simultaneously by using different power
chips. In order to achieve batteries charging and discharging
functions, the buck circuit and boost circuit are driven
separately. However, the efficiency of the method is low and
the sampling circuit is complex. Furthermore, the
complexity of the peripheral circuit will lead to an increase
in the size of the
system. And the feedback control and PID
control will be more difficult to achieve due to real-time
signal sampling [2-3]. The discrete structure of bidirectional
DC-DC converter is used in reference [4]. In this DC-DC
converter, the integrated circuit chip TPS5430 is used to
design the buck circuit and the UC3842 is used to design the
boost circuit. According to the test results, the efficiency of
the converter is not more than 94%, and it is difficult to
distinguish whether this efficiency is boost circuit or buck
circuit. However, there is no doubt that the converter is
inefficient and the indicators of the converter are not good
enough, such as cost and volume.
This work is supported by National Nature Science Foundation under
Grant #
61503169
and the Nature Science Foundation of Liaoning Province
under Grant # 2015020102.
The proposed converter design method uses integrated
Buck/Boost bidirectional DC-DC circuit. The charging and
discharging function of the battery can be realized. The
converter operates in Buck mode when the lithium battery is
charging. Yet the circuit operates in Boost mode when the
lithium battery is discharged through the load resistor. The
SCM with A/D conversion ports is used to
design the
converter in the premise of meeting the accuracy
requirements, thus there is no need to design A/D and D/A
circuits by using other devices [5]. The inductance and
capacitance required in the circuit are selected through
theoretical calculations and practical experience, which is
very important for minimizing the overall converter size.
Dual closed-loop PID control method is used in the
converter to maintain system stability. Additionally, the
converter working mode can be set by the keys, and the
current step value can also be set in the same way. In the
prototype test, the system can work stably for a long time
with small fluctuation and high overall efficiency.
2 OVERALL PROGRAM DESIGN
The bidirectional DC-DC converter is used for power
storage and transmission to five lithium batteries. The
overall design scheme is shown in Figure 1. SCM
STC12C5A60S2 is the main control chip of the converter
and it can output two PWM signals which use to drive and
control the half-bridge circuit designed by fully controlled
device MOSFET.
The half-bridge drive circuit can achieve
boost and step-down functions. The key circuit consisting of
4 buttons can adjust the working mode and current value.
The Buck/Boost bidirectional DC-DC circuit adopts the half
bridge topology to realize the power bidirectional
transmission, which can charge and discharge the lithium
Design of Bidirectional DC-DC Converter Based on Single Chip Microcomputer
Yuanzheng Wu
1
, Yajun Wang
1
, Wu Ning
1,2
1. School of Electronic and Information Engineering, Liaoning University of Technology, Jinzhou 121001, China
E-mail: 271559565@qq.com
2. College of Information Science and Engineering, Northeastern University, Shenyang 110004
E-mail: 3311230659@qq.com
Abstract: A bidirectional DC-DC converter based on single chip microcomputer (SCM) is designed by adopting
bidirectional buck-boost topology instead of the traditional method of separately designing boost circuit and buck circuit.
The converter is designed to achieve charging and discharging functions of five 18650 lithium-ion batteries. The main
control chip of the converter is SCM STC12C5A60S2. The IR2104 half-bridge driver with bootstrap function is selected
to drive MOSFET for stable turn-on and turn-off. The converter includes sampling circuit formed by the sampling
resistor and the op amp op07 and display circuit formed by LCD1602, which can sample and display current and voltage
in real time in both charging mode and discharging mode of the converter. In addition, the converter can control the
current through keys. The overall system structure is simple, easy to control and low cost. The conversion efficiency is
greatly improved using synchronous rectification. In the prototype test, the current fluctuation is small and the voltage
stability is high. The designed converter is applied to a small DC motor drive circuit in a laboratory, the motor works
well.
Key Words: Bidirectional DC/DC converter; SCM control; Half bridge drive; Five 18650 lithium-ion batteries
6015
978-1-5386-1243-9/18/$31.00
c
2018 IEEE
资源评论
weixin_38703895
- 粉丝: 4
- 资源: 910
最新资源
- 39-0305一元矩阵w偏导-1080P 高清-AVC.mp4
- Comsol光子晶体板谷态.pdf
- Comsol光子晶体板EP.pdf
- Comsol光子晶体板模式识别：全模型方法与半模型方法对比.pdf
- COMSOL光子晶体波导法诺共振.pdf
- COMSOL光子晶体光纤：有效折射率、模式色散及有效模式面积计算.pdf
- COMSOL光子晶体光纤：有效折射率、模式色散、有效模式面积计算.pdf
- 43-0309对数线性回归与广义线性回归-1080P 高清-AVC.mp4
- 42-0308求导没推给个例子-1080P 高清-AVC.mp4
- Comsol光子晶体光纤模式分析及其fsm mode计算.pdf
- COMSOL光子晶体连续域束缚态远场偏振计算：含K空间能带Q值模型及Matlab脚本及相关文献.pdf
- COMSOL光子晶体光纤及反谐振光纤：计算有效折射率、模场及多种损耗分析.pdf
- COMSOL光子晶体六边形晶格简约第一布里渊区能带.pdf
- COMSOL光子晶体能带计算的复现.pdf
- Comsol光子晶体能带求解：含一维和二维色散材料的光子晶体计算.pdf
- 44-0310对数或逻辑线性回归-1080P 高清-AVC.mp4
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
