| 摘要 |
An electronic flash device includes a first DC-DC converter circuit of separately-excited type, a second DC-DC converter circuit of separately-excited type, a capacitor to be charged by the first DC-DC converter circuit and the second DC-DC converter circuit, and a discharge tube which converts charging energy charged to the capacitor into light energy. The first DC-DC converter circuit includes a first switching element having a first control electrode, and an a first oscillation transformer to which energization is controlled by the first switching element. A first control pulse signal is supplied to the first control electrode. The second DC-DC converter circuit includes a second switching element having a second control electrode, and an a second oscillation transformer to which energization is controlled by the second switching element. A second control pulse signal is supplied to the second control electrode. The first DC-DC converter circuit and the second DC-DC converter circuit are connected in parallel, and the first and second control pulses are supplied such that the second control electrode changes from a non-energizing state to an energizing state before the first control electrode changes from an energizing state to a non-energizing state.
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