| 摘要 |
<p>A battery-backed power supply (200) and method of supplying battery-backed power are disclosed. The method comprises providing a power converter (210) for generating a direct current (DC) output (212) from an alternating current (AC) input (205). The DC output (212) is selectively decoupled (S1) from an enabled DC output (216) to enable monitoring (240) of the DC output (212). When decoupled, the DC output signal (212) is sampled and the DC output and supply output (296) are then recoupled after the sampling. The enabled DC output (216) can be selectively coupled to a battery (260). The charge current between the enabled DC output (216) and the battery output (294) is sensed (250) to control charging of the battery by pulse-width modulation of the selective coupling (S2) between the enabled DC output (216) and the battery output (264). The DC output (212) and the battery output (264) are coupled in a logical-or configuration to generate a supply output (296) that provides current from the battery (260) and from the DC output (212). The sampling of the DC output is bypassed if an input voltage signal indicates that the AC input (205) is inactive. Use of such a battery backed power supply in a movable partition system is also disclosed.</p> |
