| 摘要 |
PURPOSE:To detect an angle by a simple circuit, by using the output of a counter as the input data of a latch circuit and setting timing for latching the same to the zero cross point of an output signal. CONSTITUTION:The output clock of a reference clock generation circuit 1 is counted by a counter 2 and the output signal thereof is applied to read-only memories 3, 4, in which sine and cosine data were preliminarily stored, as an address signal. The outputs of the read-only memories 3, 4 are applied to the exciting winding of a resolver 20 through digital/analogue converters 5, 6 and power amplifiers 7, 8. The output signal of the resolver 20 is shaped by a wave form shaping circuit 18 to output a logic signal and the data of the counter 2 is latched at the rising edge of said logic signal by a latch circuit 16.
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