BATTERY CHARGING AND LAMP LIGHTING CONTROL CIRCUIT

摘要

During a non-charging time, a thyristor (7-1) maintains its off even if any half-wave component (Wp) rises. The voltage of the half-wave component (Wp) has a waveform that is similar to a sinusoidal wave during a non-load time. A voltage detecting circuit (801) detects the voltage of the half-wave component (Wp). A voltage shift circuit (803) shifts down the detected waveform by a shift voltage corresponding to a charging voltage (Vc). An integrating circuit (804) outputs an integration output as a delay time instruction (Vt). A gate control circuit (805) turns on a thyristor (7-2) at a timing delayed from the rise of a half-wave component (Wn) of negative side in accordance with the delay time instruction (Vt). An output current to be supplied to a lamp 6 rises in a delay time (Td) proportional to the area of an excessive portion. The peak value of the output current during the non-charging time can be adjusted and uniformed with reference to an output current during a charging time.