DC power supply with standby passage

Abstract

The invention discloses a DC power supply with a standby passage. The DC power supply comprises a normally-used passage and the standby passage which are connected in parallel, wherein the normally-used passage comprises a DC high-frequency switch module, a voltage regulation module and a second switch, the standby passage comprises a first switch, a standby DC module and a third switch, and the first switch is arranged at an input end of an emergency power supply. When a fault occurs in the normally-used passage, the first switch is switched off for conduction by a DC high-frequency switch so that the problem of electric delay on the emergency power supply is effectively solved; and an isolation module is arranged at an output end of the normally-used passage and an output end of the standby passage, the problem of current circulation during the switching process of the power supply is solved by employing a mode that the first switch is firstly switched on, the second switch is switched off and the third switch is switched on, and reverse current is prevented. The DC power supply is applicable to an occasion with high requirement on voltage fluctuation, and the application stability and reliability of the DC power supply can be effectively improved.

Description

technical field [0001] The invention relates to power supply equipment, in particular to a direct current power supply. Background technique [0002] The high-voltage switch of the high-voltage power distribution cabinet needs the switching power supply to be able to provide continuous power supply to provide effective opening and closing protection for the equipment. At present, the main DC power supply is equipped with a backup DC power supply to provide power for the quick switch. Switching mode to ensure the reliability of power supply. However, in the process of using the existing dual DC power supply, when disconnecting the main DC power supply first and then connecting the backup DC power supply, there is capacitance at the input end of the main power supply, which may easily cause a power-on delay of the backup power supply; When the power supply is disconnected from the main power supply, due to the voltage difference between the two power supplies, a circulating c...

AI Technical Summary

Problems solved by technology

However, in the process of using the existing dual DC power supply, when disconnecting the main DC power supply first and then connecting the backup DC power supply, there is capacitance at the input end of the main power supply, which may easily cause a power-on delay of the backup power supply; When the power supply is disconnected from the main power supply, due to the voltage difference between the two power supplies, it is easy to form a circulating current between the two power supplies, which may easily cause current backflow.

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