Method and electrical equipment for detecting electrical leakage
A technology of electrical appliances and current sensors, which is applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc., and can solve problems such as increasing costs
Active Publication Date: 2017-12-19
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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Problems solved by technology
[0004] Therefore, the existing leakage protection device needs to add additional devices on the basis of the original circuit for electrical leakage protection, which increases the cost
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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] In order to facilitate understanding of the embodiments of the present invention, several elements that will be introduced in the description of the embodiments of the present invention are firstly introduced here.
[0035] (A) Application and basic circuits in household appliances, such as air conditioners, refrigerators, washing machines, etc. Such as figure 2 As shown, the circuit includes a three-phase rectifier bridge, a three-phase inverter bridge, t...
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Embodiments of the present invention provide a method for detecting electrical leakage and electrical equipment, which relate to the technical field of electrical leakage protection, so as to realize simple and reliable detection of electrical leakage without additional devices. The method for detecting electrical leakage includes: before starting the motor, conducting the lower bridge arm of the three-phase inverter bridge for a period of time, the period of time being an integer multiple of the power cycle; According to the current value of each current sensor at each sampling moment obtained according to the sampling interval; according to the current value of each current sensor at each sampling moment in the time period, obtain the current value used to characterize the three current sensors throughout the time The current measurement parameter in the segment; if the current measurement parameter is greater than or equal to a preset threshold value, then it is determined that the electric appliance is leaking electricity, and the preset threshold value is determined according to that the circuit components in the electric appliance are not damaged of.
Description
technical field [0001] The invention relates to the technical field of electrical leakage protection, in particular to a method for detecting electrical leakage and electrical equipment. Background technique [0002] In the electrical age, many household appliances are inseparable from the support of electricity, but sometimes in the process of using household appliances, there will be a numb feeling when touching the shell, and the neon lamp will glow when tested with an electric pen. This is the leakage that people often encounter. Phenomena, how to ensure that users can use it safely, and how to avoid the danger of leakage are crucial issues in the field of home appliances. [0003] In the prior art, unsafe accidents caused by electrical equipment leakage are avoided by adding leakage protection circuits or electronic detection elements (such as neon tubes, capacitors, resistors, relays, etc.). Such as figure 1 Shown is a leakage protection circuit for an air conditione...
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IPC IPC(8): G01R31/02G01R19/165H02H3/34
Inventor 张三艳曹锐李希志沈乾军
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST