A Design of SCR Three-Phase AC-Voltage Regulator Simplify Circuitry Based on STM32 MCU

This paper introduces a novel design of three-phase AC-voltage regulation trigger circuitry using silicon controlled rectifier (SCR), and presents its application in an energy-saving design of oil extractor control system. The design employs photoelectric isolation technique and the inter-phase of three-phase power supply itself, only three groups of triggering signals are required to control the six thyristors conducting angles. The generation of high-precision triggering signals and PID control regulator functions are realized by programming the multiple high-performance timers and the AD interface of a STM32 microprocessor. Experiments and in-field tests have shown the feasibility of the proposed scheme.

Research on the Anti-Interference of Mine Soft-Start Controller

According to QJR-400 mine explosion-proof and intrinsically safe AC motor soft-start controllers are subject to various interference, to analyze interference source, interference factors and its consequences, and to study on the those interferences that has taken measures. In the hardware design, to use photoelectric isolation, anti-interference regulated power supply and reasonable grounding and other measures, which can effectively avoid interference. In the software design, digital filtering program can effectively eliminate the interference of random signals and pulse signals. The experimental results show that these measures can effectively inhibition of external interference.

Design of a Multi-Mode Asymmetric Waveform Generator for FAIMS

The performance of a high-field asymmetric waveform ion mobility spectrometry (FAIMS) detector is directly related to the quality of the asymmetric waveform generator. In this paper, we propose a design scheme of a multi-mode asymmetric waveform generator based on the half-bridge architecture, using a direct digital synthesizer (DDS) method to produce a frequency adjustable square wave pulse and half-sine pulse signal. An isolation circuit was combined with a drive circuit through a TLP250 which is a MOSFET driver chip with photoelectric isolation. The frequency of the proposed waveform generator can be easily controlled.

Study on the Control Technology of Piezoelectric Transducer Assembly

The author analyzes the problems existing in the traditional assembly system and puts forward a new method based on the motor control. This paper introduces the design and development of the automatic assembly system of ultrasonic cleaning transducer. In the system we use photoelectric isolation technology to solve the problems that driving circuit interference control chip while using a chip control many motors and this simplify the assembly system structure, reduce the cost of the assembly system and improve the assembly system automation and precision.