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Programmable Switching Power Supply

Author: ZhangYanZuo
Tutor: WangYan；LiuSiJiu
School: Harbin Institute of Technology
Course: Aviation Aerospace Manufacturing Engineering
Keywords: Programmable power supply USB control Flyback converter Small signal analysis
CLC: TN86
Type: Master's thesis
Year: 2008
Downloads: 262
Quote: 2
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Abstract

Programmable power supply is an intelligent power supply, depending on the environment it needs for other devices meet the specifications of energy, not only widely used in automatic test systems, and can be used as a universal power source, and experimental studies in industrial production etc. plays an important role in the field. Despite the current market many types of programmable power supply, and the adjustment range, the control accuracy and other performance indicators are also a variety of options, but because of its mostly with PC interface GPIB or RS-232 interface, the AC input voltage range is fixed and bulky, expensive, making it difficult for the actual users set up a small automatic test system to accept. To solve these problems, this paper developed a USB-based interface to control a wide range of input voltage programmable switching power supply. This paper presents the overall design of programmable power solutions, then use the chip switching power supply chip TOPSwitch design a wide input voltage range of low-power flyback switching power supply, switching power supply for the core power conversion components - high-frequency transformer a detailed analysis and design; Secondly, the use of state-space averaging method derived flyback switching power supply main circuit power stage low-frequency small-signal model and analyze the switching power supply feedback loop transfer function, and thus the whole switching power supply system of the system Modeling and analysis of its stability; again, in order to design the switching power supply as the primary power source, the amount of feedback with a feedback loop to change the size of the control strategy, in theory, to achieve a power supply output voltage amplitude linear regulator; final to integrate the USB function controller Soc C8051F320 chip system controller as the core of the control circuit, a programmable power supply design hardware control circuit, and use C51 language of the microcontroller firmware and the use of the Visual Basic language developed programmable power supply PC an application software program. Through the development of low-power programmable power supply for experiments and test results show that the main performance indicators, such as voltage adjustment range, precision voltage regulation, load regulation, output voltage ripple, all reached the design requirements. This paper developed a USB-based programmable power supply has been applied to actual projects, practice shows that with the common GPIB and RS-232 interface, programmable power supply compared to its ease of use and maneuverability greatly enhanced.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply
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