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Method and safety device for ground fault protection circuit

A technology for detecting devices and generating circuits, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., and can solve problems such as increased costs of wires and systems, complex GFCIs, and circuit redundancy

Inactive Publication Date: 2010-05-05
特里尼迪股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The disadvantage of this solution is the circuit redundancy of the transition, the GFCI is complicated due to its supposed function, namely, automatic non-efficiency detection; moreover, to define the critical nodes for voltage sampling, where the nodes Not always easily accessible, leading to increased cost of wires and systems on the other hand, the GFCI circuit architecture applied to this invention can be considered prior knowledge

Method used

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  • Method and safety device for ground fault protection circuit
  • Method and safety device for ground fault protection circuit
  • Method and safety device for ground fault protection circuit

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Embodiment Construction

[0046] The invention will now be described in terms of a household appliance, namely a hair dryer - however, it will be apparent to those skilled in the art that the invention is equally applicable to other applications such as tools equipped with reliable GFCIs, factory machines, or any other electrical equipment.

[0047]In a particular embodiment, the GFCI is integrated in a plug at the end of the power cord of the hair dryer, however, this embodiment is not to be considered as a limitation of the invention. However, advantageous solutions equivalent to the above are also obtained by integrating the GFCI of the invention into a wall socket in which the plug of the hair dryer or another household appliance is inserted.

[0048] refer to figure 1 , a block diagram of a GFCI 1 according to the present invention can be seen, said single-phase power network or power supply being designated 10; connect. Other types of controlled switches (or circuit breakers), ie semiconductor...

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Abstract

The invention refers to a method and an apparatus (1) for protecting people against leakage currents while using appliances such as home appliances or the like. The apparatus (1) is provided with a differential switch (20) normally open and a differential current transformer (39) which generates a signal proportional to the leakage current, an elaboration unit (50) interfaced with the latter acquires said signal and keeps the switch (20) closed until a dangerous condition is met, corresponding to an acquired signal having a magnitude greater than a limit value.

Description

technical field [0001] The invention relates to a method for preventing leakage currents and a device for carrying out the method. Background technique [0002] The risk of electrocautery is known to be high when using devices provided by the power network and which may come into direct contact with persons; this is why safety standards prescribe protective differential circuit breakers. [0003] Typically, in a single-phase system, the utility power network (also known as the mains) supplies the electrical installation (ie, generally the load) through two wires, one of which is called the "hot" or "phase wire" and the other is called "neutral wire". Typically, the utility company near the distribution cabin grounds the neutral. [0004] A general type of home injury usually occurs when a person uses a device provided by the electrical grid while bathing or near a sink. The water becomes a pathway for an electrical current, called a leakage current or ground fault, from t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/33G01R31/327H02H3/10
CPCG01R31/3277H02H3/335H02H3/105
Inventor S·赞多尼拉巴尔科
Owner 特里尼迪股份有限公司