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Testing Instrument of PTCR Voltage-withstanding Based on ATmega16L

Author: SongGuoDong
Tutor: LiBuYin
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: PTCR ATmega16L voltage-withstanding the low to high voltage switch circuit the display circuit
CLC: TM835.1
Type: Master's thesis
Year: 2009
Downloads: 12
Quote: 0
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Abstract


PTCR resistances have been widely used in industrial electronic equipment, telecommunication and household appliances. As PTCR resistances have been widely used, the production of resistances become larger and larger, which demand higher reliability of PTCR themselves. One of their important performances is voltage-withstanding. So PTCR resistances pass voltage-withstanding test before using.Design of PTCR voltage-withstanding test instrument based on ATmega16L MCU is discussed in this thesis.This instrument can be used to measure the PTCR resistances’voltage-withstanding ability. The control circuit is re-builded and the related procedure is programmed in this design based on the core control chip ATmega16L.Hardware and software design are discussed in detail in the thesis. ATmega16L MCU is chosen as the core of the controlling unit which mainly includes the low to high voltage switch circuit, the control circuit of increasing voltage in sequence, the display circuit, key-presses, JTAG and ISP interface. These replace the original time’relays and sequential logic control circuit, simplify the circuit and save the cost. LED is chosen to display the result, afterward LED is substituted by LCD for necessary characters display and convenience for future use. These two display methods have been introduced in this thesis.The software system adopts C as program language, ICC AVR as compile software. Software design mainly includes initialization of MCU, saving and reading the information from EEPROM, LED dynamic scanning/ LCD display, key-press program design and so on.The initialization of MCU includes initialization of I/O ports, timers, external interrupts. The combination of LED display, LCD display and key-press can realize the function of timing automatically and display setting the time of high-to-low voltage, the data is saved in EEPROM and can be read at anytime, so it do not need to be configured each time. The system uses timer to time, so the result is very accurate and can meet the testing requirement. The system also has the alarm function, when error occurs in the voltage-increasing process, the system can alarm automatically. At last, AVR Studio can be applied as simulation software to emulate the program in single-step, process and breakpoint, making sure the program is correct. Through cooperating of hardware and software, this design improves the digital and intelligent level of the testing instrument of PTCR voltage-withstanding.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High voltage test equipment and measurement techniques > High - voltage measurement technique > Measurement methods and equipment for high voltage
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