A grounding detection device for the grounding wire of household appliances
A technology for household appliances and ground detection, which is applied in the direction of measuring devices, instruments, and measuring electronics, can solve the problems of complex circuits and high costs of ground detection devices, and achieve the effects of low cost, high reliability, and easy production
Active Publication Date: 2019-03-22
QINGDAO HAIER TECH
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a grounding detection device for the ground wire of household appliances to solve the problems of complex circuits and high costs of the grounding detection device in the prior art
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[0034] In order to solve the problem of complex circuit and high cost of the prior art grounding detection device, the present invention provides a grounding detection device for the ground wire of household appliances. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035] A grounding detection device for a household electrical appliance grounding wire according to an embodiment of the present invention is as follows: figure 1 As shown, it includes a voltage difference detection signal generation unit 1 , an isolation unit 2 and a control unit 3 , wherein the isolation unit 2 is connected to the voltage difference detection signal generation unit 1 and the control unit 3 respectively.
[0036] The voltage difference detection signal generation unit...
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The invention discloses a grounding detection device for a household electrical appliance ground wire. The device includes: a voltage difference detection signal generation unit used for generating a voltage difference detection signal according to a voltage difference of a ground wire of a direct current power supply based on intermediate voltage of an L line and an N line and a household electrical appliance ground wire; a control unit connected with the voltage difference detection signal generation unit and used for judging whether grounding performance of the household electrical appliance ground wire is good according to the voltage difference detection signal and giving an alarm when contact is poor. The grounding detection device for the household electrical appliance ground wire can detect whether the ground wire in the home of a user is good in grounding, if the ground wire is poor in contact or no ground wire exists, early warning can be provided in advance. The grounding detection device provided by the invention uses a simple circuit and common components, is low in cost, easy to produce and high in reliability, and is not subjected to interference of static electricity and induced electricity.
Description
technical field [0001] The invention relates to the technical field of grounding, in particular to a grounding detection device for grounding wires of household appliances. Background technique [0002] At present, the electrical appliances used in the user's home, such as water heaters, refrigerators, washing machines, etc., are all standard three-pin plugs, and the grounding end on the plug is connected to the shell of the home appliance for protective grounding. However, the ground wire of the three-hole socket in some users' homes may not be connected, or may be in poor contact. In this case, if the casing of the home appliance is charged, it will not be able to form a current loop to cause the leakage protector to trip, and it will not be able to protect the personal safety of the user. [0003] The inventor finds when realizing the present invention, existing technology has following shortcoming: [0004] 1. The current home appliances do not have the function of det...
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IPC IPC(8): G01R31/02
Inventor 麻文山
Owner QINGDAO HAIER TECH