Design of AC chopper voltage regulator based on PIC16F716 microcontroller

Abstract

Base on the principle of AC chopper, a new digital AC voltage regulating generator is designed by PIC16F716. The IGBT devices are used in the main AC chopper circuit, and the feasibility of circuit is analyzed by PSPICE software. The control circuit of PIC16F716 and drive circuit of IGBT are also described in paper. At last, the AC voltage regulating generator is developed and tested, from the testing results, it can be seen that the AC voltage regulating generator not only has excellent performance of input current and output voltage, but also can control according to the demand of user and loads smartly.

Experimental and Simulation Research of Channel Flowmeter Based on Gas and Water

“…According to the relevant public literature, the V-cone flowmeter has a measurement accuracy of ±0.5% and a repeatability of 0.1% when the turndown ratio is 30:1 [4 , 6 ] .Research shows that although the special V-cone throttling device of the V-cone flowmeter has a c e r t a i n r e c t i f i c a t i o n e f f e c t , t h e low-pressure pressure taking area is still in the traditional separation area, so the inevitable existence of pulsating flow in the l o w -p r e s s u r e a r e a i s e s s e n t i a l l y i m p o s s i b l e t o a v o i d f l o w separation. [7] Therefore, the optimization and improvement of the throttling device of the differential pressure flowmeter has not stopped for a long time. In recent years, the appearance of the channel flowmeter has made a breakthrough in this research.…”