Logic Circuits Timing Analysis Using Timed Logic Variables

Combinational logic circuit timing analysis is an important issue that all designers need to address. The present paper presents a simple and compact analysis procedure. We follow the guidelines drawn by previous methods, but we shall define new time-dependent logic variables that help us improve their efficiency. By using the methodology suggested, we shall replace a very laborious technique (pure delay circuit + time constants method) with a simpler procedure that can pinpoint the specific conditions for a logic circuit’s anomalous behaviour within a few simple steps. Considering the logic function implemented the methodology presented will require analysis of only a limited number of situations/combinations to determine the presence of an anomalous behaviour. When anomalous behaviour is identified, the methodology provides a clear timing description.

Circuit Design of Eyesight Protection Device which is Based on a Single Chip

Design the circuit of vision protector based on 8051 single chip microcontroller. The core of hardware is the 8051 single chip microcomputer, function circuit including sensor auxiliary sit straight alarm circuit, light alarm circuit, timing alarm circuit and alarm circuit. Have a basic understanding of SCM, then design each functional circuit, development software system, complete the design.

Design of Intelligent Actuation Time Measurement for Low Voltage Electrical Apparatus

In order to measure the actuation time of low voltage electrical apparatus, this paper designs an intelligent timing device triggered by single and double circuits. The device adopts the system structure of the upper and lower computer so that the action signals will be collected and measured by lower computer through conditioning, and the measurement results will be shown on the digital tube. Through communication with lower computer by RS232 serial port, the upper computer can display the real-time status and results of the measurement and issue commands to control the operation of the device. Utilizing modular programming, and targeted for the action characteristics of different components, this paper puts forward adaptive optimization testing algorithm, which can achieve single / double circuit timing, digital display, upper computer monitoring, manual / programmed control, the positive and negative transition trigger of the adaptive input signal and other functions. After the tests on actual functionality and reliability, the device is successfully applied in aircraft power supply system. The results suggest that the function of the timing device is complete, its structure is simple, easy to maintain, and it can meet the measurement requirements of the actuation time for low voltage electrical components.