| 摘要 |
PURPOSE:To reduce the size and to eliminate a pulsating current by providing a shortcircuit preventing transistor, thereby preventing a current flowed to a coil from becoming a spike state. CONSTITUTION:A shortcircuit preventing transistor switch Q5 is controlled to be turned OFF by a signal M whenever the first transistor switch (hereinafter called 'switch) Q2 is turned ON in the state that the second switch Q2 is ON and the third switch Q3 is OFF by signals H, J, G to flow a current to a coil A. Thus, a shortcircuit of the voltage induced in a coil inverter A, i.e., a shortcircuit having a surge killer diode D3 and the first switch Q1 is turned OFF. Accordingly, the current Ia flowed to the coil-A due to the shortcircuit of the induced voltage of the coil A does not become spike state. When a current is flowed to the coil-A, a shortcircuit preventing transistor Q4 is similarly operated. |
