| 摘要 |
<p>PURPOSE: To simplify a circuit by adopting a microcomputer for enabling the intellectual control by controlling a current supply means connected to a control objective valve by adding a dither signal to a variable duty pulse, after the variable duty pulse is produced so as to be suitable for input data. CONSTITUTION: Every time an interruption is applied, dither data provided from a dither signal generating means are stored in the register corresponding to the output port of an input/output processing part 104, and are converted into series dither data by a PS converting part 115, and are supplied to two OR logic gates 119, 120 respectively. Accordingly, proportion valves 5, 5a are always oscillated in a minute displacement. To control the operations of proportion valves 5, 5a, a CPU 101 accomplishes the control for generating variable duty pulses in response to the input data. Thus, the circuit constitution is simplified, and the adjustment of parameters can be facilitated.</p> |
