A circuit for detecting poor grounding
A technology for poor grounding and detection of grounding, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of electric damage to the power supply case, and achieve the effect of low cost and reliable detection.
Active Publication Date: 2019-03-08
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
[0003] The current AC power supply connects the power supply case with the external system through a ground wire. If the ground wire is missing or in poor contact, it will cause the power supply case to be charged and injure people.
Method used
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Embodiment 1
[0048] refer to Figure 6 As shown, it is a preferred embodiment of the present invention, wherein, C1=C2=4.7nF, R1=R2=R3=R5=R6=1MΩ, R4=500kΩ, R7=1Ω, C3=68nF, voltage regulator D1 is 5.6 V, the comparator reference voltage Vin- is 1V, and the primary side voltage PRI is 12V. The ratio of the sum of the resistance values of the resistors in the detection circuit to the capacitive reactance of C1 and C2 is 0.25-1.
[0049] refer to Figure 7 As shown, when the AC power supply is well grounded, as shown in path 1, when the AC input L voltage is higher than the N voltage, the current path is L→R1→R2→PE2→LINE2→LINE1→PE1 power chassis. Or, when the AC input N voltage is higher than the L voltage, the current path is N→R6→R2→PE2→LINE2→LINE1→PE1 power enclosure.
[0050] Therefore, there is no voltage drop across the detection resistor, the rectifier filter circuit has no voltage input, the comparator U1Vin+ is 0V, Vin- is 1V reference, the operational amplifier U1 outputs a low ...
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The invention relates to a circuit for detecting poor grounding, and belongs to the field of power supply safety. The circuit for detecting poor grounding comprises a detection circuit, a rectification and filtering circuit and a comparator. The first end of the detection circuit is connected with an AC power supply, the second end of the detection circuit is connected with a ground wire detecting line, the third end of the detection circuit is connected with the rectification and filtering circuit, and the fourth end of the detection circuit is connected with a power supply casing; and the detection circuit is used detect whether poor grounding occurs. One end of the rectification and filtering circuit is connected with the detection circuit, and the other end of the rectification and filtering circuit is connected with the comparator; and the rectification and filtering circuit is used to rectify and filter the voltage input by the detection circuit. The comparator determines whether poor grounding occurs according to the voltage output by the rectification and filtering circuit.
Description
technical field [0001] The invention relates to the field of power supply safety, in particular to a circuit for detecting poor grounding. Background technique [0002] The design of AC power supply must meet the principle of not hurting people. Therefore, ensuring good grounding has become the focus of AC power supply design. [0003] The current AC power supply connects the power supply case with the external system through a ground wire. If the ground wire is missing or in poor contact, it will cause the power supply case to be charged and injure people. Contents of the invention [0004] The object of the present invention is to provide a circuit for detecting poor grounding, which is used for detecting poor grounding of AC power supply. [0005] The purpose of the present invention is achieved through the following technical solutions: [0006] In the first aspect, a circuit for detecting poor grounding includes a detection circuit, a rectification filter circuit a...
Claims
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 向军宋石磊
Owner HUAWEI DIGITAL POWER TECH CO LTD