Power-off circuit, DC combined power supply system and power-off control method
A combined power supply and circuit control technology, applied in the field of communication, can solve the problem that the power-off circuit cannot simultaneously have the power supply reliability of the battery over-discharge protection and energy-saving system.
Active Publication Date: 2017-02-08
ZTE CORP
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Problems solved by technology
[0007] The invention provides a power-off circuit, a DC combined power supply system and a power-off control method to at least solve the problem in the related art that the power-off circuit cannot simultaneously provide battery over-discharge protection and energy saving and ensure system power supply reliability
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[0024] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0025] This embodiment provides a power-off circuit, such as image 3 As shown, the power-off circuit includes: a power-off control circuit 102 for controlling the opening and closing of the first contactor 104 and the second contactor 106; the first contactor 104 is connected to the battery and the first busbar Between, the important load is connected to the above-mentioned first bus, and the above-mentioned first contactor is a magnetic holding type DC contactor; the second contactor 106 is connected between the first bus and the second bus, and the secondary load is connected to the above-mentioned On the second bus, the above-mentioned second contactor is a normally closed DC contactor.
[0026...
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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.
Description
technical field [0001] The present invention relates to the communication field, in particular to a power-off circuit, a DC combined power supply system and a power-off control method. Background technique [0002] The DC combined power system generally consists of a DC power supply and a battery. The DC power supply converts AC or other energy sources into stable DC power to supply power to the load and charge the battery. The battery is used as a backup power supply to supply power to the load when the DC power supply stops working. Because excessive discharge of the battery will cause damage to the battery, the DC combined power supply system must be designed with a battery over-discharge protection circuit to ensure that the battery will not be damaged by over-discharge. [0003] The battery over-discharge protection of the DC power supply system generally adopts a circuit structure that is powered off in stages. There are currently two main circuit structures: [0004]...
Claims
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IPC IPC(8): H02J7/34
CPCH02J7/0031H02J9/005Y02B70/30Y04S20/20
Inventor 叶家炬
Owner ZTE CORP