| 摘要 |
<p>A device and method for realizing power switch. The device includes a first power circuit (1) and a second power circuit (2) connected to a load (3) in common. The first power circuit (1) includes a first controllable switch (15) which is connected between an input end and an output end of the first power circuit (1); and a first detecting circuit (16) which is set to control the first controllable switch (15) to close when detecting that the input end voltage of the first controllable switch (15) is higher than the output end voltage, and to control the first controllable switch (15) to open when detecting that the input end voltage of the first controllable switch (15) is lower than the output end voltage. The second power circuit (2) includes a second controllable switch (25) which is connected between an input end and an output end of the second power circuit (2); and a second detecting circuit (26) which is set to control the second controllable switch (25) to close when detecting that the input end voltage of the second controllable switch (25) is higher than the output end voltage, and to control the second controllable switch (25) to open when detecting that the input end voltage of the second controllable switch (25) is lower than the output end voltage. And a first power voltage (17) is higher than a second power voltage (27).</p> |
