| 摘要 |
PROBLEM TO BE SOLVED: To provide a completely novel two-way step-up/down converter both for alternating current and for direct current, which increases or decreases alternating- current, direct-current, or both current-superposed input voltage; is provided with an automatic voltage regulating function and thus compatible with conventional alternating-current transformers; is capable of directly increasing/decreasing and converting in two ways direct-current voltages and direct currents, such as those in fuel cells and photovoltaic power generation, as well as in 400-Hz power supplies; and is of small size and light-weight and efficient. SOLUTION: The two-way step-up/down converter both for alternating current and for direct current is so constituted that an alternating-current, direct-current, or both current-superposed input voltage is modulated at a frequency higher that at least an input frequency, and the modulated voltage is applied to a high-frequency autotransformer. The voltage is then increased or decreased and demodulated, and then smoothed. Thus, the converter is capable of increasing and decreasing the original alternating-current, direct-current, or both current-superposed input voltage and letting electric power energy flow in either of directions, normal direction or reverse direction. COPYRIGHT: (C)2004,JPO
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