| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive circuit for a solenoid pump that establishes drive using a given pulse frequency, facilitates a change in and a correction of control characteristics and excels in control accuracy even for a small flow rate. SOLUTION: An SP driving current is subjected to averaging to a constant direct current level and to voltage amplification, and an SP driving current mean value is input into an A/D conversion input port of a microcomputer, which in turn controls an SP driving signal according to the value. A difference between the SP driving current mean value and an SP driving current reference value is amplified by an SP driving current differential amplifier, whose output is input into the A/D conversion input port of the microcomputer. COPYRIGHT: (C)2004,JPO
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