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Relay-type leakage current protection device

a leakage current protection and relay-type technology, applied in the field of electric appliances, can solve problems such as hidden safety threats and use of electrical appliances, and achieve the effect of enhancing protection effectiveness

Active Publication Date: 2021-03-11
LI CHENGLI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The device effectively prevents hidden safety threats by timely cutting off current flow between the input and output ends when internal faults are detected, enhancing user safety and protection.

Problems solved by technology

For example, when internal components of the protection device become faulty and lose their protection function, the relay coil of the protection device may still have current flowing through it, so that the power input end and the load end are still electrically connected.
This is a hidden safety threat in the use of the electrical appliances.

Method used

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  • Relay-type leakage current protection device
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  • Relay-type leakage current protection device

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0030]As shown in FIG. 1, the relay-type leakage current protection device according to the first embodiment includes: a switch circuit 1, a relay circuit 3, a leakage current detection circuit 4, a self-test circuit 5, and a drive circuit 6. The switch circuit 1 is coupled between the input end LINE and output end LOAD of the main power lines, to control the electrical connection between the input end LINE and the output end LOAD. The relay circuit 3 is coupled to the input end LINE and the switch circuit 1, for controlling the operation of the switch circuit 1. The leakage current detection circuit 4 is coupled to the main power lines, to detect leakage current that may be present at the output end LOAD of the main power lines. The self-test circuit 5 is coupled to the main power lines and the leakage current detection circuit 4, for periodically generating self-test pulse signals that simulates a leakage current, to detect whether the leakage current detection circuit 4 is faulty...

second embodiment

[0044]FIG. 2 illustrates a relay-type leakage current protection device according to the second embodiment. In this embodiment, the leakage current protection device includes: a switch circuit 1, a relay circuit 3A, a leakage current detection circuit 4, a self-test circuit 5, and a drive circuit 6. The structure and function of the switch circuit 1, the leakage current detection circuit 4, the self-test circuit 5, and the drive circuit 6 are the same as or similar to those of the corresponding circuits of the first embodiment, and their descriptions will not be repeated here.

[0045]As shown in FIG. 2, in the relay circuit 3A, the rectifier BD is a full-wave rectifier; its first end is coupled to the resistor-capacitor voltage step-down circuit 31, its second end is coupled to the relay RELAY, its third end is coupled to the neutral line N, and its fourth end is coupled to ground. As compared to the first embodiment, the rectifier BD can provide twice the current to the relay RELAY.

[...

third embodiment

[0049]FIG. 3 illustrates a relay-type leakage current protection device according to the third embodiment. In this embodiment, the leakage current protection device includes: a switch circuit 1, a relay circuit 3B, a leakage current detection circuit 4, a self-test circuit 5, and a drive circuit 6. The structure and function of the switch circuit 1, the leakage current detection circuit 4, the self-test circuit 5, and the drive circuit 6 are the same as or similar to those of the corresponding circuits of the first embodiment, and their descriptions will not be repeated here.

[0050]As shown in FIG. 3, the current limiting circuit of the relay circuit 3B includes a voltage step-down circuit 32 and a rectifier. The voltage step-down circuit 32 is a resistor R8, with its one end coupled to the input side, operable to limit the maximum working current flowing through the relay RELAY. The rectifier includes a diode D5, i.e., it is a half-wave rectifier. One end of diode D5 of the rectifie...

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PUM

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Abstract

A relay-type leakage current protection device includes a switch circuit, a relay circuit, a leakage current detection circuit, a self-test circuit, and a drive circuit. The switch circuit controls electrical connection between input and output ends of the power supply. The relay circuit is coupled to the input end and controls the open / close state of the switch circuit. The leakage current detection circuit detects a leakage current on the power supply lines. The self-test circuit is coupled to the power supply lines and the leakage current detection circuit, to generate a self-test pulse signal which simulates the leakage current and to detect a fault condition in the leakage current detection circuit. The drive circuit drives the relay circuit in response to receiving a leakage current signal from the leakage current detection circuit or a fault signal from the self-test circuit.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]This invention relates to electrical appliances, and in particular, it relates to a relay-type leakage current protection device for electrical appliances.Description of Related Art[0002]With the wide-spread use of electrical appliances in the homes, the safety of such appliances is important. Currently, many home electrical appliances are equipped with protection devices, such as electrical plugs incorporating leakage current protection devices. However, such devices still have certain shortcomings. For example, when internal components of the protection device become faulty and lose their protection function, the relay coil of the protection device may still have current flowing through it, so that the power input end and the load end are still electrically connected. This is a hidden safety threat in the use of the electrical appliances.[0003]There is a great need for a leakage current protection device that is easy to instal...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02H3/32H02H1/00H02H3/04
CPCH02H3/32H02H3/044H02H1/0007H02H3/335
Inventor LI, CHENGLICHEN, LONGNIE, SHENGYUN
Owner LI CHENGLI