| 摘要 |
PURPOSE:To reduce gas consumption by combining a three-input integration circuit, two hysteresis comparators and two diodes in a loop shape in order to smoothly open, close and drive a high pressure gas valve using a steering gas servo. CONSTITUTION:When an analog input signal 100 comes to a -Ein, an output pulse 101 outputted from the three input integration circuit 1 linearly increases in a positive direction by an inclination in proportion to the analog input signal 100. When the voltage of the output pulse 101 attains E1, the voltage of an output pulse 102 outputted from the hysteresis comparator 2 is inverted from -E0 to +E0, and the diode 4 is turned on. Since the input of the three input integration circuit 1 becomes E0-Ein (provided that E0>Ein), the output pulse 101 outputted from the three input integration circuit 1 linearly changes in a negative direction. The output pulse of a duty factor in proportion to the analog input can be obtained from different output terminals corresponding to the polarities of the analog input.
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