| 摘要 |
PURPOSE:To suppress unnecessary heat, by controlling a switch element for feeding driving current to a motor and a flywheel element connected in parallel with the motor respectively with opposite polarities. CONSTITUTION:Comparators 26, 27 compare a triangular wave signal outputted from a triangular wave generating circuit 25 respectively with comparison voltages VS and VT to produce pulse signals S1, S2 having opposite polarities. OFF time interval where the pulse signal S2 is in low level is set longer than ON time interval where the pulse signal S1 is in high level. The pulse signals S1, S2 are fed respectively to a switch element 23 and a flywheel element 22. Consequently, heating at the flywheel element section can be suppressed. |
