CN111693897A - Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line - Google Patents
Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line Download PDFInfo
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- CN111693897A CN111693897A CN202010730473.2A CN202010730473A CN111693897A CN 111693897 A CN111693897 A CN 111693897A CN 202010730473 A CN202010730473 A CN 202010730473A CN 111693897 A CN111693897 A CN 111693897A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a circuit and a system capable of simultaneously detecting a grounding condition and a zero-live wire reverse connection, wherein the circuit comprises a live wire connecting end, a zero wire connecting end, a first detection end and a second detection end, a first resistor and a fourth resistor are respectively connected between the live wire connecting end and the first detection end and between the zero wire connecting end and the second detection end, a second resistor and a fifth resistor are respectively connected between the first detection end and a power supply and between the second detection end and the power supply, and a third resistor and a sixth resistor are respectively connected between the first detection end and a ground end and between the second detection end and the ground end. The circuit is simple in structure and only comprises 6 resistors, and the cost is greatly reduced.
Description
Technical Field
The invention relates to the field of detection circuits, in particular to a circuit and a system capable of simultaneously detecting grounding conditions and reverse connection of a zero line and a live line.
Background
In the process of arranging and wiring the alternating-current charging piles, some wiring personnel can connect zero and live wires of the incoming lines of the alternating-current charging piles to the ground wires in a reverse or leakage mode. Many alternating-current charging stake do not have zero live wire at all on the market and connect anti-automated inspection function or ground wire to detect the function, and this brings the hidden danger for alternating-current charging stake safety. The existing alternating current zero-live wire connection reverse detection adopts an alternating current zero-live wire connection reverse and ground wire abnormity detection circuit with application number of 201510378212.8, and the detection circuit comprises a zero-live wire connection reverse detection loop, a ground wire abnormity detection loop and a signal output loop, and is based on devices such as a resistor, a triode, an optical coupling isolator, a diode and the like, so that the circuit structure is complex and the cost is high.
Disclosure of Invention
The present invention provides a circuit and a system for simultaneously detecting the grounding condition and the reverse connection of the zero line and the live line, which aims to solve the technical problems.
The invention is realized by the following technical scheme:
the utility model provides a circuit that can detect ground connection condition and zero live wire simultaneously and connect conversely, includes live wire link, zero line link, first detection end and second detection end, be connected with first resistance and fourth resistance between live wire link and the first detection end, between zero line link and the second detection end respectively, be connected with second resistance and fifth resistance between first detection end and the power, between second detection end and the power respectively, be connected with third resistance and sixth resistance between first detection end and the ground, between second detection end and the ground respectively. The circuit structure of this scheme is simple, only contains 6 resistances, and is not connected reversely, is connected reversely, the unusual three kinds of condition of ground connection at the normal zero live wire of ground connection, first sense terminal and second sense terminal output voltage waveform are different, can judge the zero live wire wiring and the ground connection condition through detecting the discernment to the waveform, reduce the cost greatly.
Preferably, in order to facilitate the determination of the voltage at the detection end, the resistance values of the second resistor and the third resistor are equal.
Preferably, in order to control the detection circuit, switches are provided on connection lines between the third resistor, the sixth resistor and the ground.
A system capable of simultaneously detecting grounding condition and reverse connection of a zero line and a live line comprises the device and a controller for detecting output voltage waveforms of a first detection end and a second detection end to realize identification of the grounding condition and the reverse connection of the zero line and the live line.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the circuit of the invention has simple structure, only comprises 6 resistors, can realize the accurate judgment of the grounding condition and the reverse condition of zero and live wire connection, and has low cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a waveform diagram of the output of the detection terminal in the case of normal grounding in embodiment 2.
Fig. 3 is a waveform diagram of the output of the detection terminal in case of an abnormal ground in embodiment 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The circuit capable of simultaneously detecting the grounding condition and the reverse connection of the zero line and the live line as shown in fig. 1 comprises a live line connecting end L, a zero line connecting end N, a first detection end Lad and a second detection end Nad, wherein a first resistor R1 and a fourth resistor R4 are respectively connected between the live line connecting end and the first detection end, between the zero line connecting end and the second detection end, a second resistor R2 and a fifth resistor R5 are respectively connected between the first detection end and a power supply VDD, and a third resistor R3 and a sixth resistor R6 are respectively connected between the first detection end and the ground end and between the second detection end and the ground end. The whole circuit is connected with a controller through the first detection end and the second detection end, and the controller can judge the grounding condition and the reverse condition of zero and live wire connection through the recognition of voltage waveforms of the two detection ends.
During detection, if the zero line and the live line are not connected reversely and are grounded normally at the same time, namely 220V alternating current is input into the live line connecting end L, the zero line connecting end N is connected to the zero line.
By the theorem of thevenin,
the high-point voltage of the first detection terminal Lad is:
VLad-h={[(VL-VDD)*R2/(R1+R2)+VDD]*R3}/[(R1*R2)/(R1+R2)+R3],
wherein, VLIndicating the voltage of the live wire connection end L;
the low point voltage is:
VLad-L={[(VDD-VL)*R1/(R1+R2)+VL]*R3}/[(R1*R2)/(R1+R2)+R3]；
the voltage at the second detection terminal Nad is:
VNad= VDD *R6/ (R5+R6)。
whether the grounding condition and the zero line and the live line are reversely connected can be judged by detecting the voltage waveform between the first detection end Lad and the second detection end Nad.
Example 2
Based on the above embodiments, this embodiment discloses a specific implementation manner, and as also shown in fig. 1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are respectively 10M Ω, 56 Ω, 10M Ω, 56 Ω, and 56 Ω, the power supply is 3.3V, and the switch K1 is connected between the common terminal GND of the third resistor R3 and the sixth resistor R6 and the ground terminal PE.
During the detection, if the zero line and the live wire are not connected reversely and are grounded normally at the same time, namely, 220V alternating current is input into the live wire connecting end L, the zero line connecting end N is connected onto the zero line, the switch K1 is closed, and the GND is conducted with the ground end PE.
By adopting the specific circuit, when the zero-fire wire is not connected reversely and the grounding is normal,
the high-point voltage of the first detection terminal Lad can be simplified as follows:
VLad-h=(VL*R3+3.3*R1)/(2*R1+R3)
=(311*56+3.3*10000)/ (2*10000+56)V
=(311*56+33000)/ 20056 V
=+2.513V
the low-point voltage of the first detection terminal Lad can be simplified as follows:
VLad-L=(3.3*R1+VL*R3)/(2R1+R3)
=(3.3*10000-311*56)/ (2*10000+56)V
=(33000-311*56)/ 20056 V
=+0.777V
the voltage at the second detection terminal Nad can be simplified as follows:
VNad= VDD *0.5=+1.65V
the specific waveform is shown in FIG. 2, wherein the waveform A is the first detection terminal Lad VLadWaveform B is VNadA voltage waveform diagram.
When the zero line and the live line are connected reversely and the ground is normal, referring to fig. 2, the voltage waveforms of Lad and Nad are just opposite, that is, the waveform in fig. 2 is the first detection end Lad VLadWaveform A is VNadA voltage waveform diagram.
When the grounding is abnormal, no matter whether the zero line and the live line are reversely connected, as shown in fig. 3, the waveform illustrates that: waveform A is VLadVoltage waveform diagram, waveform B is VNadVoltage waveform diagram, VladAnd VNadBoth are sine waves, the high point voltage of the two waveforms is 2.04V, and the low point voltage is 1.14V.
When the main control MCU collects the voltage values of the Lad and the Nad, the grounding condition and the zero-live line connection condition can be judged by identifying and judging the voltage waveforms output by the first detection end Lad and the second detection end Nad.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. The utility model provides a circuit that can detect ground connection condition and zero live wire simultaneously and connect conversely, its characterized in that, includes live wire link, zero line link, first sense terminal and second sense terminal, be connected with first resistance and fourth resistance between live wire link and the first sense terminal, between zero line link and the second sense terminal respectively, be connected with second resistance and fifth resistance between first sense terminal and the power, between second sense terminal and the power respectively, be connected with third resistance and sixth resistance between first sense terminal and the ground, between second sense terminal and the ground respectively.
2. The circuit of claim 1, wherein the second resistor and the third resistor have equal resistance values.
3. The circuit for simultaneously detecting the grounding condition and the zero-live wire reverse connection according to claim 1, wherein a switch is arranged on a connection line between the third resistor, the sixth resistor and the ground.
4. A system for simultaneously detecting grounding condition and zero line and live line reversal, comprising the device of any one of claims 1 to 3 and a controller for detecting output voltage waveforms of the first detection terminal and the second detection terminal to realize identification of grounding condition and zero line and live line reversal condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010730473.2A CN111693897A (en) | 2020-07-27 | 2020-07-27 | Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010730473.2A CN111693897A (en) | 2020-07-27 | 2020-07-27 | Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111693897A true CN111693897A (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010730473.2A Pending CN111693897A (en) | 2020-07-27 | 2020-07-27 | Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111693897A (en) |
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2020
- 2020-07-27 CN CN202010730473.2A patent/CN111693897A/en active Pending
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