| 摘要 |
PURPOSE:To obtain the simplification of the whole circuit of a drive device constructed only to amplify the output of a square-wave oscillation circuit by adopting a construction only to make the resistance value in a discharge resistance circuit in the said circuit variable. CONSTITUTION:In this drive device for an electromagnetic pump, a charge resistance circuit 3A and a discharge resistance circuit 3B are separately provided in a square-wave oscillation circuit 3, and the resistance value in the discharge resistance circuit 3B is made variable. This construction permits to keep a constant time width to give pressure to discharge fluid by a piston in the electromagnetic pump and change it only when the pressure is not given by the piston. That is, a variable resistance VR1 in the discharge resistance circuit 3B is variably adjusted to regulate the time of discharge, and the supply of fuel oil is regulated in a heater. In this construction, since the resistance value in the discharge resistance circuit 3B is only made variable, the circuit can be simplified as a whole. |
