| 摘要 |
PURPOSE:To eliminate the influence of the ripple of a DC/DC converter by constructing to supply electric power to a load from a storage battery and to interrupt the output of the converter at the time of supplying the power. CONSTITUTION:When a switch S1 is closed, the first and second condensers 4, 6 start charging, voltages V1, V1' rise, and when the voltage V1' becomes higher than the prescribed value, the output of a comparator 31 is inverted, a control circuit 33 receives it and sets the output signal Salpha to ''L'', thereby stopping the oscillation of a DC/DC converter 2. A transistor Tr is conducted with the ''H'' of the output signal Sbeta, and the charge stored in the first condenser 4 is supplied to an LED5. In this manner, since the output of the converter 2 is interrupted at the time of operating an automatic focusing, the influence of the ripple can be eliminated. |
