FUNCTION GENERATOR

• Main Author: DAIGO AKIHIKO
• Format: Patent
• Language: English
• Published: 06.06.1984
• Subjects: ANALOGUE COMPUTERS; CALCULATING; COMPUTING; COUNTING; PHYSICS

PURPOSE:To simplify the circuit constituting a power-factor indicator, by performing the summing/subtracting integration of a pulse width, which is attained by slicing a sine wave voltage, and a measured pulse width to balance them so that both pulse widths coincide with each other and smoothing and taking out the output. CONSTITUTION:The sine wave voltage due to a reference sine wave voltage generating circuit (b) is inputted to the plus input terminal of a comparator A4, and the output of an operational amplifier A3 is inputted to the minus input terminal, and they are compared with each other. A pulse train having a pulse width T per unit time which is equal to a part obtained by slicing the sine wave voltage with the output of the amplifier A3 is attained in the output of the comparator A4. This pulse train and a pulse train attained at a point C are subjected to the summing/subtracting integration in an integrating circuit (d). Since the output of the amplifier A3 is varied by turn-on and off states of transistors Tr1 and Tr2, widths of both pulse trains are equalized by a closed circuit consisting of the amplifier A3 and the comparator A4 to obtain a balanced state. The output of the amplifier A3 is smoothed by a smoothing circuit (e) and is converted to a DC.