| 摘要 |
<p>PURPOSE:To provide rapid and accurate frequency comparing operation and to obtain a reliable fail-safe performance by converting via an F-DE converting function and a V-F converting function a train speed signal inputted in low frequency to a high frequency signal and doubling a speed signal series from a tachometer generator. CONSTITUTION:The same F-DC converters 14, 15 are connected to a tachometer generator TG, an analog switch 16 is connected to the converters, the same V-F converters 17, 18 are connected to the switch 15, the same frequency comparators 19, 20 are connected to the converters 17, 18 and an ATS pattern frequency generator 11, and an FF21 having set and reset terminals S, R is connected to the comparators 19, 20. When the switch 16 is switched, the converters 14, 17 are connected in series, a frequency signal indicating a train speed generated from the generator TG is converted by the converter 14 into a voltage, converted again to a frequency by the converter 17, and returned.</p> |
