| 摘要 |
<p>A switching circuit with an independent DC power supply unit (20) includes a switching unit (10), the power supply unit (20) for the switching unit (10), a switching on/off unit (30) for the power supply unit (20) and a switching control signal transmission unit (40). The switching control signal transmission unit (40) transmits the control signal from a control unit (50) to the switching on/off unit (30). The switching on/off unit (30) switches on/off in response to the control signal so that the power supply unit (20) is controlled to supply power to the switching unit (10) or not. The switching unit (10) and the control unit (50) have independent power supply units (20, 60) respectively. The switching unit (10) switches on when the power supply unit (20) supplies power thereto; otherwise, the switching unit (10) switches off. Thus, the power loss generated when the switching unit (10) switches off is reduced.</p> |
