| 摘要 |
PURPOSE:To reduce the frequency of clock pulse required for the operation of triangular wave, by a method wherein the changing capacity of the data of the triangular wave for 1 clock pulse is arranged to be optionally changeable. CONSTITUTION:The pulse of frequency in proportion with the output frequency (f) of an inverter is generated from an oscillator 1, and the pulse is for output as clock pulse Ps, PT via dividers 2, 3. The clock pulse, for example PT is conducted to a counter 9 and the output of the counter 9 is provided for the input for address signal of a memory circuit ROM10. The triangular wave data are memorized in the ROM10 as binary number signal, and the output of the memorized content is provided according to the address signal of the ROM10, and the output is compared with the output of ROM6 memorizing sine wave data. As a result, PWM signal Q can be obtained. |
