Novel low-current branch circuit disconnection detection circuit and method
An open circuit detection, small current technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of misjudgment of small current open circuit state, unreliable technical solutions, misoperation of fitting formulas, etc., to achieve accuracy High, low cost, easy to operate effect
Active Publication Date: 2014-10-08
NANJING LEKTEC ENG DATA TECH
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Problems solved by technology
However, the difference between the experimental conditions and the actual industrial site environment, the limited experimental data, and the misoperation of the experimenters may introduce certain errors into the fitting formula, resulting in misjudgment of the small current open circuit state.
Therefore, this technical solution is not very reliable
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[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0029] A new small current branch circuit break detection circuit, comprising an S1 smart switch 1, an L1 load halogen lamp 2 and a small current LED lamp board 3, the S1 smart switch 1 is connected in series with the L1 load halogen lamp 2, and the S1 smart switch 2 and the small current LED lamp board 3 are connected in series.
[0030] The small current LED lamp board 3 includes a resistor R1, a diode D1, a capacitor C1, a resistor R2 and a small current LED. The current LEDs are connected in series, the other end of the capacitor C1 is grounded, and the small current LED4 is connected in series with the...
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The invention discloses a novel low-current branch circuit disconnection detection circuit which comprises an intelligent switch S1, a load halogen lamp L1 and a low-current LED lamp panel, wherein the intelligent switch S1 is in series connection with the load halogen lamp L1; the intelligent switch S1 is in series connection with the low-current LED lamp panel. Compared with a multi-threshold-value decision scheme based on a fitting method, the novel low-current branch circuit disconnection detection circuit has the advantages that a large number of experimental sample data are not needed, and the dependency on experimental conditions and personnel quality is low; AD sampling only needs to be carried out on a voltage of the switch at the time of disconnection, and then whether an open circuit fault happens can be judged according to the shape of the waveform of the voltage; the novel low-current branch circuit disconnection detection circuit is easy and convenient to operate, high in accuracy, free of changes of working voltages, low in cost and capable of being realized just by adding some simple resistors, capacitors and diodes into a circuit.
Description
technical field [0001] The invention relates to small current branch circuit break detection, in particular to a novel small current branch circuit break detection circuit and method. Background technique [0002] Usually, the method of sampling the total load current is used to judge the on-off state of the load branch. When an open circuit occurs in a load branch, the total load current will decrease. Therefore, the total load current is sampled, and when the sampled value is lower than a certain threshold, it is judged that a load branch is disconnected. [0003] The small current branch is characterized by a small rated current, and the rated current is only tens of milliamperes. And it is required to correctly detect the on-off state of the branch within a given working voltage range. When the working voltage changes between 24V and 30V, the variation of the total load current can reach hundreds of milliamperes, which is greater than the rated current of the small cu...
Claims
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Inventor 姚建宁叶敬史卫庆
Owner NANJING LEKTEC ENG DATA TECH