CN203572906U - Grounding wire electrified detection device - Google Patents
Grounding wire electrified detection device Download PDFInfo
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- CN203572906U CN203572906U CN201320712567.2U CN201320712567U CN203572906U CN 203572906 U CN203572906 U CN 203572906U CN 201320712567 U CN201320712567 U CN 201320712567U CN 203572906 U CN203572906 U CN 203572906U
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Abstract
The utility model relates to a grounding wire electrified detection device, which comprises a detection circuit and a voltage comparison circuit, wherein the detection circuit is bridged between a heating pipe and a wall body, and is connected with the voltage comparison circuit through being serially connected with an optocoupler; the voltage comparison circuit comprises a filtering circuit, and the voltage comparison circuit transmits signals to a microprocessor through the filtering circuit; the detection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, the optocoupler, a first diode and a second diode; and the voltage comparison circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a third diode, a voltage comparator and a processor. The grounding wire electrified detection device can judge whether the electricity leaks or not through voltage comparison after being connected with a grounding wire, can consume the induced electromotive force generated in circuits reliably, and can avoid misoperation.
Description
Technical field
The utility model relates to a kind of pick-up unit, specifically relates to a kind of measuring device with electricity of water heater ground wire, belongs to circuit safety equipment technical field.
Background technology
The detection of electrical leakage of pot-type boiler is an important technical indicator.By retrieval, find; mainly contain two kinds of Chinese utility model patents for earth strap electric detection means: 1, Chinese practical type patent 200720103710.2 discloses a kind of water heater with electric leakage alarm function, its essence is by realizing creepage protection function being connected the electricity leakage sensor being formed by neon bulb and current-limiting resistance between inner bag and body of wall.The problem that this function exists: when expansible anchor of metal is installed, may occur neon bulb and expansible anchor of metal loose contact, final impact detects effect and maybe can not detect.Even if it is charged that result is ground wire, user also cannot clearly see that the glittering or warning light of warning light at all can not be glittering.2, Chinese practical type patent 200920192981.9 also discloses a kind of technical scheme of electric heater ground wire electrified detection, its essence is testing circuit is connected between zero line and live wire, when zero line is charged, neutral line current flows to ground wire by a large resistance, now, by testing circuit, judge that whether ground wire is charged.This function has problems too: if the house that user lives does not have ground wire, together with at this moment user may receive zero line with ground wire, if zero line and ground wire are due to the damaged contact electrification object of insulated hull.Result is that both are simultaneously charged, can not detect.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, a kind of earth strap electric detection means is provided, this pick-up unit is connected with ground wire and can judges whether electric leakage by voltage ratio, can reliably consume the induction electromotive force producing in circuit, avoids misoperation.
The technical scheme providing according to the utility model, a kind of earth strap electric detection means comprises testing circuit and voltage comparator circuit; Described testing circuit is connected across between heating tube and body of wall, by series connection optocoupler, is connected with described voltage comparator circuit; The filtering circuit that voltage comparator circuit consists of the tenth resistance and the 3rd electric capacity transfers signals to microprocessor.
Described testing circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, optocoupler, the first diode, the second diode; Described body of wall is connected with the first resistance and the 3rd resistance one end respectively; The described first resistance other end is connected with second resistance one end; The described second resistance other end is connected with heating tube one end; The described heating tube other end is connected with the first diode anode; Described the first diode cathode connects the 4th resistance one end; Described the 4th resistance other end is connected with the negative electrode of optocoupler and the second diode respectively; The anode of described the second diode connects and composes testing circuit with the other end and the optocoupler of described the 3rd resistance R 3 respectively;
Described voltage comparator circuit comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 3rd diode, voltage comparator and processor; Described first electric capacity one end is connected with the reverse input end of power supply, the 3rd diode anode, the 5th resistance one end, second electric capacity one end, voltage comparator respectively; The reverse input end of described voltage comparator is detection signal end; Described the first electric capacity other end ground connection; Described the 5th resistance other end ground connection; Described the second electric capacity other end ground connection; The 3rd diode cathode connects voltage; The reverse input end of described voltage comparator is connected with the 3rd electric capacity one end, and ground connection; Described the 6th resistance one end connects power supply; Described the 6th resistance other end is connected with the positive input of the 7th resistance one end, the 8th resistance one end, voltage comparator respectively, and the positive input of described voltage comparator is reference voltage end; Described the 7th resistance other end connects voltage; Described the 7th resistance one end is connected with positive input and the 8th resistance one end of voltage comparator respectively; The positive input of described voltage comparator connects voltage; Described the 8th other end of resistance and the output terminal of voltage comparator are connected; The output terminal of described voltage comparator is connected with one end of the 9th resistance, one end of the tenth resistance respectively; The other end of described the 9th resistance connects voltage; The other end of described the tenth resistance connects and composes voltage comparator circuit with the other end of processor and the 3rd electric capacity respectively.
Compared with the prior art the utility model has the following advantages:
The utility model, as long as be connected with ground wire and can judge whether electric leakage by voltage ratio, can reliably consume the induction electromotive force producing in circuit, avoids misoperation.
Accompanying drawing explanation
Fig. 1 is circuit frame principle figure of the present utility model.
Embodiment
The utility model is further described in connection with the embodiment in accompanying drawing below:
As shown in Figure 1, a kind of earth strap electric detection means comprises testing circuit and voltage comparator circuit; Described testing circuit is connected across between heating tube XC2 and body of wall XC1, by series connection optocoupler, is connected with described voltage comparator circuit; Described voltage comparator circuit has filtering circuit, and the filtering circuit that voltage comparator circuit consists of the tenth resistance R 10 and the 3rd capacitor C 3 transfers signals to microprocessor.
Described testing circuit comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, optocoupler PHT1, the first diode VD1, the second diode VD2; Described body of wall XC1 is connected with the first resistance R 1 and the 3rd resistance R 3 one end respectively; Described first resistance R 1 other end is connected with second resistance R 2 one end; Described second resistance R 2 other ends are connected with heating tube XC2 one end; The described heating tube XC2 other end and the first diode VD1 anodic bonding; Described the first diode VD1 negative electrode connects the 4th resistance R 4 one end; Described the 4th resistance R 4 other ends are connected with the negative electrode of optocoupler PHT1 and the second diode VD2 respectively; The anode of described the second diode VD2 connects and composes testing circuit with the other end and the optocoupler PHT1 of described the 3rd resistance R 3 respectively;
Described voltage comparator circuit comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 3rd diode VD3, voltage comparator N1A and MCU processor; Described first capacitor C 1 one end is connected with the reverse input end 2 of power vd D, the 3rd diode VD3 anode, the 5th resistance R 5 one end, second capacitor C 2 one end, voltage comparator N1A respectively; The reverse input end 2 of described voltage comparator N1A is detection signal end; Described the first capacitor C 1 other end ground connection GND; Described the 5th resistance R 5 other end ground connection GND; Described the second capacitor C 2 other end ground connection GND; The 3rd diode VD3 negative electrode connects voltage VCC; The reverse input end 2 of described voltage comparator N1A is connected with the 3rd capacitor C 3 one end, and ground connection GND; Described the 6th resistance R 6 one end connect power vd D; Described the 6th resistance R 6 other ends are connected with the positive input 3 of the 7th resistance R 7 one end, the 8th resistance R 8 one end, voltage comparator N1A respectively, and the positive input 3 of described voltage comparator N1A is reference voltage end; Described the 7th resistance R 7 other ends connect voltage VCC; Described the 7th resistance R 7 one end are connected with positive input 3 and the 8th resistance R 8 one end of voltage comparator N1A respectively; The positive input 3 of described voltage comparator N1A connects voltage VCC; The other end of described the 8th resistance R 8 is connected with the output terminal 1 of voltage comparator N1A; The output terminal 1 of described voltage comparator N1A is connected with one end of the 9th resistance R 9, one end of the tenth resistance R 10 respectively; The other end of described the 9th resistance R 9 connects voltage VCC; The other end of described the tenth resistance R 10 connects and composes voltage comparator circuit with the other end of MCU processor and the 3rd capacitor C 3 respectively.
During normal work: body of wall XC1 and heating tube XC2 are not charged, electric potential difference is 0 or while being less than safe voltage 36V, after optocoupler PHT1 coupling weak electric signal, very little at first capacitor C 1 place's no-voltage or voltage, when being less than reference voltage, signal is after voltage comparator N1A processes, its output terminal 1 output high level signal, after the filtering circuit forming through the tenth resistance R 10, the 3rd capacitor C 3, send MCU to, normal through MCU processor decision signal, can not send alerting signal.
When body of wall and heating tube ground connection are when charged: body of wall XC1 and heating tube XC2 are charged, when electric potential difference is greater than safe voltage 36V, after optocoupler PHT1 coupling weak electric signal, at the first capacitor C 1 place, produce voltage, when being greater than reference voltage, after voltage comparator N1A processes, its output terminal 1 output low level signal, after the filtering circuit forming through the tenth resistance R 10, the 3rd capacitor C 3, send MCU to, abnormal through MCU processor decision signal, send alerting signal.
Charged if there is ground connection in the course of work: between the body of wall of water heater and heating tube test side, through the first resistance R 1 in parallel, the second resistance R 2, can effectively to consume the induction electromotive force producing in circuit, avoid causing erroneous judgement disconnected.
XC1, between XC2, voltage range is wider, and the 4th resistance R 4, the three resistance R 3 resistances are also larger, and output signal may be smaller, and institute thinks enhancing output signal, PHT1 output provides power supply with VDD, and the voltage of VDD is greater than the voltage of the VCC in circuit.Use diode VD3 to carry out clamped, the misoperation that can effectively avoid like this first capacitor C 1 place's voltage to cause compared with device N1A voltage higher than voltage.During practical application, earth strap electric detection means, by after the detection of heating tube and body of wall, is input to MCU by testing result.MCU carries out computing and relatively judges that whether ground wire is charged.If find ground wire electrification phenomenon, by the control to alarm indication circuit, send alarm.
Facts have proved, the present embodiment practical application has following lifting:
1, detect earthed circuit dependence not strong, as long as be connected with ground wire, by voltage comparison signal, can judge, the calculating of the filtering by software, can appraise through comparison the glitch causing due to reasons such as environment and human factors reliably.
2, detect after electric leakage, can point out custom system electric leakage to stop using by the mode showing.
Except above-mentioned example, the utility model can also have other related embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all implement in the protection domain of this patent.
Claims (3)
1. an earth strap electric detection means, is characterized in that: comprise testing circuit and voltage comparator circuit; Described testing circuit is connected between heating tube (XC2) and body of wall (XC1), by series connection optocoupler (PHT1), is connected with described voltage comparator circuit; The filtering circuit that voltage comparator circuit consists of the tenth resistance R 10 and the 3rd capacitor C 3 transfers signals to microprocessor (MCU).
2. a kind of earth strap electric detection means as claimed in claim 1, is characterized in that: described testing circuit comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), optocoupler (PHT1), the first diode (VD1), the second diode (VD2); Described body of wall (XC1) is connected with the first resistance (R1) and the 3rd resistance (R3) one end respectively; Described the first resistance (R1) other end is connected with the second resistance (R2) one end; Described the second resistance (R2) other end is connected with heating tube (XC2) one end; Described heating tube (XC2) other end and the first diode (VD1) anodic bonding; Described the first diode (VD1) negative electrode connects the 4th resistance (R4) one end; Described the 4th resistance (R4) other end is connected with the negative electrode of optocoupler (PHT1) and the second diode (VD2) respectively; The anode of described the second diode (VD2) connects and composes testing circuit with the other end and the optocoupler (PHT1) of described the 3rd resistance (R3) respectively.
3. a kind of earth strap electric detection means as claimed in claim 1, is characterized in that: described voltage comparator circuit comprises the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 3rd diode (VD3), voltage comparator (N1A) and processor (MCU); Described the first electric capacity (C1) one end is connected with the reverse input end (2) of power supply (VDD), the 3rd diode (VD3) anode, the 5th resistance (R5) one end, the second electric capacity (C2) one end, voltage comparator (N1A) respectively; The reverse input end (2) of described voltage comparator (N1A) is detection signal end; Described the first electric capacity (C1) other end ground connection (GND); Described the 5th resistance (R5) other end ground connection (GND); Described the second electric capacity (C2) other end ground connection (GND); The 3rd diode (VD3) negative electrode connects voltage (VCC); The reverse input end (2) of described voltage comparator (N1A) is connected with the 3rd electric capacity (C3) one end, and ground connection (GND); Described the 6th resistance (R6) one end connects power supply (VDD); Described the 6th resistance (R6) other end is connected with the positive input (3) of the 7th resistance (R7) one end, the 8th resistance (R8) one end, voltage comparator (N1A) respectively, and the positive input (3) of described voltage comparator (N1A) is reference voltage end; Described the 7th resistance (R7) other end connects voltage (VCC); Described the 7th resistance (R7) one end is connected with positive input (3) and the 8th resistance (R8) one end of voltage comparator (N1A) respectively; The positive input (3) of described voltage comparator (N1A) connects voltage (VCC); The other end of described the 8th resistance (R8) is connected with the output terminal (1) of voltage comparator (N1A); The output terminal (1) of described voltage comparator (N1A) is connected with one end of the 9th resistance (R9), one end of the tenth resistance (R10) respectively; The other end of described the 9th resistance (R9) connects voltage (VCC); The other end of described the tenth resistance (R10) connects and composes voltage comparator circuit with the other end of processor (MCU) and the 3rd electric capacity (C3) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320712567.2U CN203572906U (en) | 2013-11-12 | 2013-11-12 | Grounding wire electrified detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320712567.2U CN203572906U (en) | 2013-11-12 | 2013-11-12 | Grounding wire electrified detection device |
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| CN203572906U true CN203572906U (en) | 2014-04-30 |
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| CN201320712567.2U Expired - Lifetime CN203572906U (en) | 2013-11-12 | 2013-11-12 | Grounding wire electrified detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734114A (en) * | 2015-02-25 | 2015-06-24 | 余姚市嘉荣电子电器有限公司 | Optocoupling detection ground wire voltage abnormity and earth leakage protection device |
| CN105391441A (en) * | 2015-11-23 | 2016-03-09 | 南阳理工学院 | Low-speed optical coupler acceleration circuit |
| CN110308361A (en) * | 2018-03-20 | 2019-10-08 | 浙江众邦机电科技有限公司 | A kind of grounded inspection circuit and detection method of sewing device |
| CN111102748A (en) * | 2018-10-26 | 2020-05-05 | 青岛经济技术开发区海尔热水器有限公司 | Control method of electric water heater and electric water heater |
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
-
2013
- 2013-11-12 CN CN201320712567.2U patent/CN203572906U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734114A (en) * | 2015-02-25 | 2015-06-24 | 余姚市嘉荣电子电器有限公司 | Optocoupling detection ground wire voltage abnormity and earth leakage protection device |
| CN105391441A (en) * | 2015-11-23 | 2016-03-09 | 南阳理工学院 | Low-speed optical coupler acceleration circuit |
| CN105391441B (en) * | 2015-11-23 | 2018-09-11 | 南阳理工学院 | Low-speed optical coupler accelerating circuit |
| CN110308361A (en) * | 2018-03-20 | 2019-10-08 | 浙江众邦机电科技有限公司 | A kind of grounded inspection circuit and detection method of sewing device |
| CN111102748A (en) * | 2018-10-26 | 2020-05-05 | 青岛经济技术开发区海尔热水器有限公司 | Control method of electric water heater and electric water heater |
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
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Granted publication date: 20140430 |