JPH0161614U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of this invention, and FIG. 2 is a diagram showing a conventional S/D conversion device. In the figure, 1 is a quadrant selection circuit, 2 is a cosine multiplier, 3 is a sine multiplier, 4 is a subtracter, 5 is an analog-to-digital converter, 6 is a sign inverter, 7 is an adder, 8 is a register, and 9 is a 10 is a Scott transformer, 11 is a transformer, 12 is a phase detector, 13 is a voltage controlled oscillator, 14 is a reversible counter, and 15 is a selector. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A Scotto transformer inputs a three-phase synchronized signal and converts it into a two-phase resolver signal, and a sine multiplier inputs an analog signal and a digital angle signal and multiplies the analog signal by the sine value of the digital angle. , a cosine multiplier that inputs an analog signal and a digital angle signal and multiplies the analog signal by the cosine value of the digital angle, a subtracter that subtracts the two signals, and a cosine multiplier that inputs an analog signal and multiplies the digital signal. an analog-to-digital converter that converts into , a sign inverter that inputs a digital signal and inverts its sign, a selector that inputs two digital signals and selects and outputs one of them, and an adder that adds the two signals together. A tracking type synchro-digital converter is equipped with a register for temporarily holding a digital value, and a sign determiner for inputting an analog signal and determining its sign. Input one sine wave signal of two output signals,
A cosine multiplier that inputs the digital signal of the register to a second input terminal and multiplies the sine wave signal by the value of the cosine of the angle of the digital signal, and a first input terminal that receives the two output signals of the Scott transformer. a sine multiplier that inputs one sine wave signal of the register, inputs the digital signal of the register to a second input terminal, and multiplies the cosine wave signal by the sine value of the angle of the digital signal; inputting the output of the cosine multiplier at one end, inputting the output of the sine multiplier at a second input end, a subtracter for subtracting two signals, and inputting the output of the subtracter at the input end, an analog-to-digital converter for converting into a digital signal; a sign determiner for inputting a reference signal into an input terminal and determining its sign; and a sign determining device for inputting the output of the analog-to-digital converter at an input terminal and inverting the sign. The output of the analog-to-digital converter is input to the first input terminal of the inverter, the output of the sign inverter is input to the second input terminal, and the output of the sign determiner is input to the third input terminal of the inverter. a selector that selects and outputs the signal given to the first input terminal or the signal given to the second input terminal according to the signal given to the third input terminal; an adder that inputs the output of the selector and inputs and adds a digital signal of a register to be described later to a second input terminal;
A register that inputs a clock to the input terminal of the register, inputs the output of the adder to the second input terminal, and temporarily holds the signal given to the second input terminal with the signal given to the first input terminal. A synchro digital conversion device characterized by comprising: