| 摘要 |
<p>Provided are a power-off circuit, a direct current combination power supply system and a power-off control method. The power-off circuit comprises: a power-off control circuit, used for controlling the connection and disconnection of a first contactor (KM1) and a second contactor (KM2); the first contactor (KM1), connected between an accumulator and the a first bus (1L), with the important load connected to the first bus (1L), and the first contactor (KM1) being a magnetic maintaining type direct current contactor; and the second contactor (KM2), connected between the first bus (1L) and a second bus (2L), with the secondary load connected to the second bus (2L), and the second contactor (KM2) being a normally-closed type direct current contactor. The present power-off circuit solves the problem that the power-off circuit is not energy saving because the power-off contactor needs to supply power continuously or the system power supply reliability is affected because the failure mode of the power-off contactor is not determined.</p> |
