Communication power supply circuit

Abstract

The invention discloses a communication power supply circuit, which comprises a rectifier module, a battery, a prior load and a non-prior load, the non-prior load is directly connected with the output end of the rectifier module, the prior load is coupled with the output end of the rectifier module sequentially through a BLVD contactor and a LLVD contactor which are connected in series, and the battery is coupled with the connecting node between the BLVD contactor and the LLVD contactor through a shunt. Since the non-prior load is directly electrified by the rectifier module not through the contactors, the power supply route is the shortest, and thereby a great deal of energy can be saved.

Description

technical field [0001] The invention relates to power supply equipment, in particular to a communication power supply circuit. Background technique [0002] Generally, the communication power supply loads of two-stage power-off are divided into important priority loads PL and secondary non-priority loads NPL. According to the different connection modes of load power-off and detection devices, communication power supplies commonly have the following topological circuits: [0003] (1) The first circuit such as figure 1 As shown, two monostable contactors are used, LLVD contactor (Load Low Voltage Down, load low voltage power down (also known as secondary power down)) and BLVD contactor (Battery Low Voltage Down, battery low voltage power down (Also known as a power off)) and 3 shunt shunt. The advantage of this circuit is that each current value is measured, accurate and stable. Its disadvantages are: ①There are many current-carrying devices, which increases the loss; ②The...

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Problems solved by technology

Its disadvantages are: ①There are many current-carrying devices, which increases the loss; ②The number of devices used is high and the cost is high, which has an impact on reliability; ③From the perspective of the normal load nature of the communication power supply, the general priority load PL is light load, non-priority The load NPL is heavy load, and the heavy load circuit of more than 90% of the daily working conditions of the power supply is: rectifier module Rectifier-LLVD contactor-shunt-load NPL, and the series loss is large; ) and to meet the battery charging needs, the BLVD contactor must select a large-capacity contactor according to the larger value of the two (total load current and maximum charging current), which increases the cost and structure space

Its main disadvantages are: ①The heavy-duty circuit has a current-carrying device LLVD contactor, and the load loss is large; ②After the BLVD contactor and LLVD contactor are disconnected, the auxiliary power supply of the rectifier module is still working, consuming battery energy

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