Safety devices for electrical appliances

Abstract

A safety devices includes the switch circu it, the rectification circuit and the relays. The hot wires and neutral wire connected to power source through the rectification circuit and the switch circuits provides electrical power for relays, which then connect to electric equipments. The monitor end of the switch connected to the ground is utilized to control the on / off, of the power source based on the state of the on / off of the grounding wire. The relays control the on / off of the hot wire, the neutral wire connected to the power source and the grounding wire. The invention overcoming the disadvantages in the prior art, has the features of possible to monitor hot wires, neutral wires and grounding wires, preventing reverse connection as well as simple structure, small size and possible to be embedded into electrical appliances.

Description

technical field [0001] The invention relates to the field of electrical equipment safety protection devices, and more specifically relates to an electrical equipment safety device. technical background [0002] The existing general power supply system basically uses three-wire access, the live wire and the neutral wire are used for power supply, and the ground wire plays a role in protecting users from electric shock hazards. With the popularization and use of various large-scale electrical equipment today, people pay more and more attention to the safe use of electricity, and the safety protection devices for electrical equipment are also gradually developed. More traditional mode in the prior art has fuse, safety switch, short-circuit switch and the safety protection device that is installed in the electrical equipment. Although the fuse is simple in structure and low in cost, it has been gradually withdrawn from the market due to its relativel...

AI Technical Summary

Problems solved by technology

Although the fuse is simple in structure and low in cost, it has been gradually withdrawn from the market due to its relatively rough safety performance and slow response, which has little protection for users and electrical equipment; The safety of the equipment or the user who uses the equipment has almost no effect on the safety protection of the power grid; in the prior art, various safety switches and short-circuit switches are widely used. Such safety devices are sensitive in response and can control their The entire power grid under the jurisdiction has a complex structure, high cost, and large volume. Generally, only one or several such safety devices are installed in a relatively large power unit network, and it can only be controlled from a relatively large range. The safety of the power grid; safety devices such as safety switches and short-circuit switches are generally aimed at the danger of electric shock to users caused by the live wire and neutral wire in the power grid, but it is impossible to monitor the hidden danger to users caused by whether the ground wire is connected. , in the process of wiring or installation, it can be used normally even if the grounding wire is not connected, so this kind of safety device still has certain safety hazards; the above types of safety devices also have the following disadvantages at the same time, because most of the current grid It is an AC power grid. When the live wire and the neutral wire are swapped and connected, such safety devices can be used normally, causing great danger to users and electrical equipment. Generally, such safety devices are used to monitor a certain range of power grids or a For electrical equipment, when there is a problem with the power grid or electrical equipment, the power supply will be disconnected, which plays a role in safety protection, but it cannot help users to confirm which section of the power network or which electrical equipment has a problem, which is not conducive to Maintenance; the adjustable performance of this kind of safety device is poor, the user cannot control the sensitivity of its response, and can only choose safety devices with different sensitivities according to different needs; and after the fault is eliminated, such safety devices generally need manual reset before they can be connected power line

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