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Main power supply and emergency power supply switching device having delay protection

A technology of time-delay protection and power switching, applied in circuits, electrical switches, electrical components, etc., can solve problems such as equipment damage, and achieve the effect of protecting equipment and good safety

Pending Publication Date: 2018-08-14
FOSHAN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the main power supply is restored and the power supply is switched to the main power supply again, the equipment will be damaged because the supply voltage is not stable just after the main power supply is restored.

Method used

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  • Main power supply and emergency power supply switching device having delay protection

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Embodiment Construction

[0025] In the description of the present invention, it should be noted that for orientation words, such as the term "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise " and other indication orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or in a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

[0026] In addition, terms such as "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying rela...

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Abstract

The invention discloses a main power supply and emergency power supply switching device having delay protection. The main power supply and emergency power supply switching device having delay protection comprises a contactor, an overload protection mechanism and a delay protection mechanism, wherein a contactor coil is connected with a main power supply, contactor armatures attract to each other when the main power supply is energized, a movable contact is driven to be connected with a contact of the main power supply, and power is supplied by the main power supply; when the main power supplyis disconnected, the contactor coil is deenergized, the contactor armatures are disconnected under an effect of a spring force, the movable contact is driven to be connected with an emergency power supply, and power is supplied by the emergency power supply; when the main power supply is recovered again, relatively large voltage fluctuation probably occurs due to unstable voltage at an initial stage of power supply recovery, equipment, particularly precious precise equipment can be damaged, at the moment, a delay protection mechanism acts, the power supply is connected in a delay way, and theprotection equipment is not damaged; and during short circuit, overcurrent and overload, the main power supply or the emergency power supply is disconnected by an overload protection mechanism, so that the equipment is protected, and no accident is ensured.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular to a main and backup power switching device with overload and time delay protection. Background technique [0002] In some industries, places and departments, power outages are not allowed. Generally, there are two main and backup power sources, which must ensure continuous power supply 24 hours a day. When the main power supply fails, it must immediately switch to the backup power supply to ensure uninterrupted power supply. The main standby power switch is realized by the power switch device. Current power switching devices mainly include electronic and mechanical types, but none of them have short-circuit or overload protection. When the main power supply is restored and the power supply is switched to the main power supply again, the equipment will be damaged because the supply voltage is not stable just after the main power supply is restored. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/26H01H7/08
CPCH01H7/08H01H9/26
Inventor 李秀忠
Owner FOSHAN POLYTECHNIC
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